Long live Qt!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qabstractitemview.h"
+
+#ifndef QT_NO_ITEMVIEWS
+#include <qpointer.h>
+#include <qapplication.h>
+#include <qclipboard.h>
+#include <qpainter.h>
+#include <qstyle.h>
+#include <qdrag.h>
+#include <qevent.h>
+#include <qscrollbar.h>
+#include <qwhatsthis.h>
+#include <qtooltip.h>
+#include <qdatetime.h>
+#include <qlineedit.h>
+#include <qspinbox.h>
+#include <qstyleditemdelegate.h>
+#include <private/qabstractitemview_p.h>
+#include <private/qabstractitemmodel_p.h>
+#ifndef QT_NO_ACCESSIBILITY
+#include <qaccessible.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+QAbstractItemViewPrivate::QAbstractItemViewPrivate()
+    :   model(QAbstractItemModelPrivate::staticEmptyModel()),
+        itemDelegate(0),
+        selectionModel(0),
+        selectionMode(QAbstractItemView::ExtendedSelection),
+        selectionBehavior(QAbstractItemView::SelectItems),
+        currentlyCommittingEditor(0),
+        pressedModifiers(Qt::NoModifier),
+        pressedPosition(QPoint(-1, -1)),
+        viewportEnteredNeeded(false),
+        state(QAbstractItemView::NoState),
+        editTriggers(QAbstractItemView::DoubleClicked|QAbstractItemView::EditKeyPressed),
+        lastTrigger(QAbstractItemView::NoEditTriggers),
+        tabKeyNavigation(false),
+#ifndef QT_NO_DRAGANDDROP
+        showDropIndicator(true),
+        dragEnabled(false),
+        dragDropMode(QAbstractItemView::NoDragDrop),
+        overwrite(false),
+        dropIndicatorPosition(QAbstractItemView::OnItem),
+#endif
+        autoScroll(true),
+        autoScrollMargin(16),
+        autoScrollCount(0),
+        alternatingColors(false),
+        textElideMode(Qt::ElideRight),
+        verticalScrollMode(QAbstractItemView::ScrollPerItem),
+        horizontalScrollMode(QAbstractItemView::ScrollPerItem),
+        currentIndexSet(false),
+        wrapItemText(false),
+        delayedPendingLayout(false)
+{
+}
+
+QAbstractItemViewPrivate::~QAbstractItemViewPrivate()
+{
+}
+
+void QAbstractItemViewPrivate::init()
+{
+    Q_Q(QAbstractItemView);
+    q->setItemDelegate(new QStyledItemDelegate(q));
+
+    q->verticalScrollBar()->setRange(0, 0);
+    q->horizontalScrollBar()->setRange(0, 0);
+
+    QObject::connect(q->verticalScrollBar(), SIGNAL(actionTriggered(int)),
+                     q, SLOT(verticalScrollbarAction(int)));
+    QObject::connect(q->horizontalScrollBar(), SIGNAL(actionTriggered(int)),
+                     q, SLOT(horizontalScrollbarAction(int)));
+    QObject::connect(q->verticalScrollBar(), SIGNAL(valueChanged(int)),
+                     q, SLOT(verticalScrollbarValueChanged(int)));
+    QObject::connect(q->horizontalScrollBar(), SIGNAL(valueChanged(int)),
+                     q, SLOT(horizontalScrollbarValueChanged(int)));
+
+    viewport->setBackgroundRole(QPalette::Base);
+
+    doDelayedItemsLayout();
+
+    q->setAttribute(Qt::WA_InputMethodEnabled);
+}
+
+/*!
+    \class QAbstractItemView
+
+    \brief The QAbstractItemView class provides the basic functionality for
+    item view classes.
+
+    \ingroup model-view
+    \mainclass
+
+    QAbstractItemView class is the base class for every standard view
+    that uses a QAbstractItemModel. QAbstractItemView is an abstract
+    class and cannot itself be instantiated. It provides a standard
+    interface for interoperating with models through the signals and
+    slots mechanism, enabling subclasses to be kept up-to-date with
+    changes to their models.  This class provides standard support for
+    keyboard and mouse navigation, viewport scrolling, item editing,
+    and selections.
+
+    The QAbstractItemView class is one of the \l{Model/View Classes}
+    and is part of Qt's \l{Model/View Programming}{model/view framework}.
+
+    The view classes that inherit QAbstractItemView only need
+    to implement their own view-specific functionality, such as
+    drawing items, returning the geometry of items, finding items,
+    etc.
+
+    QAbstractItemView provides common slots such as edit() and
+    setCurrentIndex(). Many protected slots are also provided, including
+    dataChanged(), rowsInserted(), rowsAboutToBeRemoved(), selectionChanged(),
+    and currentChanged().
+
+    The root item is returned by rootIndex(), and the current item by
+    currentIndex(). To make sure that an item is visible use
+    scrollTo().
+
+    Some of QAbstractItemView's functions are concerned with
+    scrolling, for example setHorizontalScrollMode() and
+    setVerticalScrollMode(). To set the range of the scroll bars, you
+    can, for example, reimplement the view's resizeEvent() function:
+
+    \snippet doc/src/snippets/code/src_gui_itemviews_qabstractitemview.cpp 0
+
+    Note that the range is not updated until the widget is shown.
+
+    Several other functions are concerned with selection control; for
+    example setSelectionMode(), and setSelectionBehavior(). This class
+    provides a default selection model to work with
+    (selectionModel()), but this can be replaced by using
+    setSelectionModel() with an instance of QItemSelectionModel.
+
+    For complete control over the display and editing of items you can
+    specify a delegate with setItemDelegate().
+
+    QAbstractItemView provides a lot of protected functions. Some are
+    concerned with editing, for example, edit(), and commitData(),
+    whilst others are keyboard and mouse event handlers.
+
+    \note If you inherit QAbstractItemView and intend to update the contents
+    of the viewport, you should use viewport->update() instead of
+    \l{QWidget::update()}{update()} as all painting operations take place on the
+    viewport.
+
+    \sa {View Classes}, {Model/View Programming}, QAbstractItemModel, {Chart Example}
+*/
+
+/*!
+    \enum QAbstractItemView::SelectionMode
+
+    This enum indicates how the view responds to user selections:
+
+    \value SingleSelection  When the user selects an item, any already-selected
+    item becomes unselected, and the user cannot unselect the selected item by
+    clicking on it.
+
+    \value ContiguousSelection When the user selects an item in the usual way,
+    the selection is cleared and the new item selected. However, if the user
+    presses the Shift key while clicking on an item, all items between the
+    current item and the clicked item are selected or unselected, depending on
+    the state of the clicked item.
+
+    \value ExtendedSelection When the user selects an item in the usual way,
+    the selection is cleared and the new item selected. However, if the user
+    presses the Ctrl key when clicking on an item, the clicked item gets
+    toggled and all other items are left untouched. If the user presses the
+    Shift key while clicking on an item, all items between the current item
+    and the clicked item are selected or unselected, depending on the state of
+    the clicked item. Multiple items can be selected by dragging the mouse over
+    them.
+
+    \value MultiSelection When the user selects an item in the usual way, the
+    selection status of that item is toggled and the other items are left
+    alone. Multiple items can be toggled by dragging the mouse over them.
+
+    \value NoSelection Items cannot be selected.
+
+    The most commonly used modes are SingleSelection and ExtendedSelection.
+*/
+
+/*!
+    \enum QAbstractItemView::SelectionBehavior
+
+    \value SelectItems   Selecting single items.
+    \value SelectRows    Selecting only rows.
+    \value SelectColumns Selecting only columns.
+*/
+
+/*!
+    \enum QAbstractItemView::ScrollHint
+
+    \value EnsureVisible  Scroll to ensure that the item is visible.
+    \value PositionAtTop  Scroll to position the item at the top of the
+           viewport.
+    \value PositionAtBottom  Scroll to position the item at the bottom of the
+           viewport.
+    \value PositionAtCenter  Scroll to position the item at the center of the
+           viewport.
+*/
+
+
+/*!
+    \enum QAbstractItemView::EditTrigger
+
+    This enum describes actions which will initiate item editing.
+
+    \value NoEditTriggers  No editing possible.
+    \value CurrentChanged  Editing start whenever current item changes.
+    \value DoubleClicked   Editing starts when an item is double clicked.
+    \value SelectedClicked Editing starts when clicking on an already selected
+           item.
+    \value EditKeyPressed  Editing starts when the platform edit key has been
+           pressed over an item.
+    \value AnyKeyPressed   Editing starts when any key is pressed over an item.
+    \value AllEditTriggers Editing starts for all above actions.
+*/
+
+/*!
+    \enum QAbstractItemView::CursorAction
+
+    This enum describes the different ways to navigate between items,
+    \sa moveCursor()
+
+    \value MoveUp       Move to the item above the current item.
+    \value MoveDown     Move to the item below the current item.
+    \value MoveLeft     Move to the item left of the current item.
+    \value MoveRight    Move to the item right of the current item.
+    \value MoveHome     Move to the top-left corner item.
+    \value MoveEnd      Move to the bottom-right corner item.
+    \value MovePageUp   Move one page up above the current item.
+    \value MovePageDown Move one page down below the current item.
+    \value MoveNext     Move to the item after the current item.
+    \value MovePrevious Move to the item before the current item.
+*/
+
+/*!
+    \enum QAbstractItemView::State
+
+    Describes the different states the view can be in. This is usually
+    only interesting when reimplementing your own view.
+
+    \value NoState        The is the default state.
+    \value DraggingState  The user is dragging items.
+    \value DragSelectingState The user is selecting items.
+    \value EditingState   The user is editing an item in a widget editor.
+    \value ExpandingState   The user is opening a branch of items.
+    \value CollapsingState   The user is closing a branch of items.
+    \value AnimatingState The item view is performing an animation.
+*/
+
+/*!
+    \since 4.2
+    \enum QAbstractItemView::ScrollMode
+
+    \value ScrollPerItem    The view will scroll the contents one item at a time.
+    \value ScrollPerPixel   The view will scroll the contents one pixel at a time.
+*/
+
+/*!
+    \fn QRect QAbstractItemView::visualRect(const QModelIndex &index) const = 0
+    Returns the rectangle on the viewport occupied by the item at \a index.
+
+    If your item is displayed in several areas then visualRect should return
+    the primary area that contains index and not the complete area that index
+    might encompasses, touch or cause drawing.
+
+    In the base class this is a pure virtual function.
+
+    \sa indexAt(), visualRegionForSelection()
+*/
+
+/*!
+    \fn void QAbstractItemView::scrollTo(const QModelIndex &index, ScrollHint hint) = 0
+
+    Scrolls the view if necessary to ensure that the item at \a index
+    is visible. The view will try to position the item according to the given \a hint.
+
+    In the base class this is a pure virtual function.
+*/
+
+/*!
+    \fn QModelIndex QAbstractItemView::indexAt(const QPoint &point) const = 0
+
+    Returns the model index of the item at the viewport coordinates \a point.
+
+    In the base class this is a pure virtual function.
+
+    \sa visualRect()
+*/
+
+/*!
+    \fn void QAbstractItemView::activated(const QModelIndex &index)
+
+    This signal is emitted when the item specified by \a index is
+    activated by the user. How to activate items depends on the
+    platform; e.g., by single- or double-clicking the item, or by
+    pressing the Return or Enter key when the item is current.
+
+    \sa clicked(), doubleClicked(), entered(), pressed()
+*/
+
+/*!
+    \fn void QAbstractItemView::entered(const QModelIndex &index)
+
+    This signal is emitted when the mouse cursor enters the item
+    specified by \a index.
+    Mouse tracking needs to be enabled for this feature to work.
+
+    \sa viewportEntered(), activated(), clicked(), doubleClicked(), pressed()
+*/
+
+/*!
+    \fn void QAbstractItemView::viewportEntered()
+
+    This signal is emitted when the mouse cursor enters the viewport.
+    Mouse tracking needs to be enabled for this feature to work.
+
+    \sa entered()
+*/
+
+/*!
+    \fn void QAbstractItemView::pressed(const QModelIndex &index)
+
+    This signal is emitted when a mouse button is pressed. The item
+    the mouse was pressed on is specified by \a index. The signal is
+    only emitted when the index is valid.
+
+    Use the QApplication::mouseButtons() function to get the state
+    of the mouse buttons.
+
+    \sa activated(), clicked(), doubleClicked(), entered()
+*/
+
+/*!
+    \fn void QAbstractItemView::clicked(const QModelIndex &index)
+
+    This signal is emitted when a mouse button is clicked. The item
+    the mouse was clicked on is specified by \a index. The signal is
+    only emitted when the index is valid.
+
+    \sa activated(), doubleClicked(), entered(), pressed()
+*/
+
+/*!
+    \fn void QAbstractItemView::doubleClicked(const QModelIndex &index)
+
+    This signal is emitted when a mouse button is double-clicked. The
+    item the mouse was double-clicked on is specified by \a index.
+    The signal is only emitted when the index is valid.
+
+    \sa clicked(), activated()
+*/
+
+/*!
+    \fn QModelIndex QAbstractItemView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) = 0
+
+    Returns a QModelIndex object pointing to the next object in the view,
+    based on the given \a cursorAction and keyboard modifiers specified
+    by \a modifiers.
+
+    In the base class this is a pure virtual function.
+*/
+
+/*!
+    \fn int QAbstractItemView::horizontalOffset() const = 0
+
+    Returns the horizontal offset of the view.
+
+    In the base class this is a pure virtual function.
+
+    \sa verticalOffset()
+*/
+
+/*!
+    \fn int QAbstractItemView::verticalOffset() const = 0
+
+    Returns the vertical offset of the view.
+
+    In the base class this is a pure virtual function.
+
+    \sa horizontalOffset()
+*/
+
+/*!
+    \fn bool QAbstractItemView::isIndexHidden(const QModelIndex &index) const
+
+    Returns true if the item referred to by the given \a index is hidden in the view,
+    otherwise returns false.
+
+    Hiding is a view specific feature.  For example in TableView a column can be marked
+    as hidden or a row in the TreeView.
+
+    In the base class this is a pure virtual function.
+*/
+
+/*!
+    \fn void QAbstractItemView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags flags)
+
+    Applies the selection \a flags to the items in or touched by the
+    rectangle, \a rect.
+
+    When implementing your own itemview setSelection should call
+    selectionModel()->select(selection, flags) where selection
+    is either an empty QModelIndex or a QItemSelection that contains
+    all items that are contained in \a rect.
+
+    \sa selectionCommand(), selectedIndexes()
+*/
+
+/*!
+    \fn QRegion QAbstractItemView::visualRegionForSelection(const QItemSelection &selection) const = 0
+
+    Returns the region from the viewport of the items in the given
+    \a selection.
+
+    In the base class this is a pure virtual function.
+
+    \sa visualRect(), selectedIndexes()
+*/
+
+/*!
+    \fn void QAbstractItemView::update()
+    \internal
+*/
+
+/*!
+    Constructs an abstract item view with the given \a parent.
+*/
+QAbstractItemView::QAbstractItemView(QWidget *parent)
+    : QAbstractScrollArea(*(new QAbstractItemViewPrivate), parent)
+{
+    d_func()->init();
+}
+
+/*!
+    \internal
+*/
+QAbstractItemView::QAbstractItemView(QAbstractItemViewPrivate &dd, QWidget *parent)
+    : QAbstractScrollArea(dd, parent)
+{
+    d_func()->init();
+}
+
+/*!
+    Destroys the view.
+*/
+QAbstractItemView::~QAbstractItemView()
+{
+}
+
+/*!
+    Sets the \a model for the view to present.
+
+    This function will create and set a new selection model, replacing any
+    model that was previously set with setSelectionModel(). However, the old
+    selection model will not be deleted as it may be shared between several
+    views. We recommend that you delete the old selection model if it is no
+    longer required. This is done with the following code:
+
+    \snippet doc/src/snippets/code/src_gui_itemviews_qabstractitemview.cpp 2
+
+    If both the old model and the old selection model do not have parents, or
+    if their parents are long-lived objects, it may be preferable to call their
+    deleteLater() functions to explicitly delete them.
+
+    The view \e{does not} take ownership of the model unless it is the model's
+    parent object because the view may be shared between many different views.
+
+  \sa selectionModel(), setSelectionModel()
+*/
+void QAbstractItemView::setModel(QAbstractItemModel *model)
+{
+    Q_D(QAbstractItemView);
+    if (model == d->model)
+        return;
+    if (d->model && d->model != QAbstractItemModelPrivate::staticEmptyModel()) {
+        disconnect(d->model, SIGNAL(destroyed()),
+                   this, SLOT(_q_modelDestroyed()));
+        disconnect(d->model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
+                   this, SLOT(dataChanged(QModelIndex,QModelIndex)));
+        disconnect(d->model, SIGNAL(rowsInserted(QModelIndex,int,int)),
+                   this, SLOT(rowsInserted(QModelIndex,int,int)));
+        disconnect(d->model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
+                   this, SLOT(rowsAboutToBeRemoved(QModelIndex,int,int)));
+        disconnect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+                   this, SLOT(_q_rowsRemoved(QModelIndex,int,int)));
+        disconnect(d->model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
+                   this, SLOT(_q_columnsAboutToBeRemoved(QModelIndex,int,int)));
+        disconnect(d->model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
+                   this, SLOT(_q_columnsRemoved(QModelIndex,int,int)));
+        disconnect(d->model, SIGNAL(columnsInserted(QModelIndex,int,int)),
+                   this, SLOT(_q_columnsInserted(QModelIndex,int,int)));
+
+        disconnect(d->model, SIGNAL(modelReset()), this, SLOT(reset()));
+        disconnect(d->model, SIGNAL(layoutChanged()), this, SLOT(_q_layoutChanged()));
+    }
+    d->model = (model ? model : QAbstractItemModelPrivate::staticEmptyModel());
+
+    // These asserts do basic sanity checking of the model
+    Q_ASSERT_X(d->model->index(0,0) == d->model->index(0,0),
+               "QAbstractItemView::setModel",
+               "A model should return the exact same index "
+               "(including its internal id/pointer) when asked for it twice in a row.");
+    Q_ASSERT_X(d->model->index(0,0).parent() == QModelIndex(),
+               "QAbstractItemView::setModel",
+               "The parent of a top level index should be invalid");
+
+    if (d->model && d->model != QAbstractItemModelPrivate::staticEmptyModel()) {
+        connect(d->model, SIGNAL(destroyed()),
+                this, SLOT(_q_modelDestroyed()));
+        connect(d->model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
+                this, SLOT(dataChanged(QModelIndex,QModelIndex)));
+        connect(d->model, SIGNAL(rowsInserted(QModelIndex,int,int)),
+                this, SLOT(rowsInserted(QModelIndex,int,int)));
+        connect(d->model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
+                this, SLOT(rowsAboutToBeRemoved(QModelIndex,int,int)));
+        connect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+                this, SLOT(_q_rowsRemoved(QModelIndex,int,int)));
+        connect(d->model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
+                this, SLOT(_q_columnsAboutToBeRemoved(QModelIndex,int,int)));
+        connect(d->model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
+                this, SLOT(_q_columnsRemoved(QModelIndex,int,int)));
+        connect(d->model, SIGNAL(columnsInserted(QModelIndex,int,int)),
+                this, SLOT(_q_columnsInserted(QModelIndex,int,int)));
+
+        connect(d->model, SIGNAL(modelReset()), this, SLOT(reset()));
+        connect(d->model, SIGNAL(layoutChanged()), this, SLOT(_q_layoutChanged()));
+    }
+    setSelectionModel(new QItemSelectionModel(d->model, this));
+    reset(); // kill editors, set new root and do layout
+}
+
+/*!
+    Returns the model that this view is presenting.
+*/
+QAbstractItemModel *QAbstractItemView::model() const
+{
+    Q_D(const QAbstractItemView);
+    return (d->model == QAbstractItemModelPrivate::staticEmptyModel() ? 0 : d->model);
+}
+
+/*!
+    Sets the current selection model to the given \a selectionModel.
+
+    Note that, if you call setModel() after this function, the given \a selectionModel
+    will be replaced by one created by the view.
+
+    \note It is up to the application to delete the old selection model if it is no
+    longer needed; i.e., if it is not being used by other views. This will happen
+    automatically when its parent object is deleted. However, if it does not have a
+    parent, or if the parent is a long-lived object, it may be preferable to call its
+    deleteLater() function to explicitly delete it.
+
+    \sa selectionModel(), setModel(), clearSelection()
+*/
+void QAbstractItemView::setSelectionModel(QItemSelectionModel *selectionModel)
+{
+    // ### if the given model is null, we should use the original selection model
+    Q_ASSERT(selectionModel);
+    Q_D(QAbstractItemView);
+
+    if (selectionModel->model() != d->model) {
+        qWarning("QAbstractItemView::setSelectionModel() failed: "
+                 "Trying to set a selection model, which works on "
+                 "a different model than the view.");
+        return;
+    }
+
+    if (d->selectionModel) {
+        disconnect(d->selectionModel, SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
+                   this, SLOT(selectionChanged(QItemSelection,QItemSelection)));
+        disconnect(d->selectionModel, SIGNAL(currentChanged(QModelIndex,QModelIndex)),
+                   this, SLOT(currentChanged(QModelIndex,QModelIndex)));
+    }
+
+    d->selectionModel = selectionModel;
+
+    if (d->selectionModel) {
+        connect(d->selectionModel, SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
+                this, SLOT(selectionChanged(QItemSelection,QItemSelection)));
+        connect(d->selectionModel, SIGNAL(currentChanged(QModelIndex,QModelIndex)),
+                this, SLOT(currentChanged(QModelIndex,QModelIndex)));
+    }
+}
+
+/*!
+    Returns the current selection model.
+
+    \sa setSelectionModel(), selectedIndexes()
+*/
+QItemSelectionModel* QAbstractItemView::selectionModel() const
+{
+    Q_D(const QAbstractItemView);
+    return d->selectionModel;
+}
+
+/*!
+    Sets the item delegate for this view and its model to \a delegate.
+    This is useful if you want complete control over the editing and
+    display of items.
+
+    Any existing delegate will be removed, but not deleted. QAbstractItemView
+    does not take ownership of \a delegate.
+
+    \warning You should not share the same instance of a delegate between views.
+    Doing so can cause incorrect or unintuitive editing behavior since each
+    view connected to a given delegate may receive the \l{QAbstractItemDelegate::}{closeEditor()}
+    signal, and attempt to access, modify or close an editor that has already been closed.
+
+    \sa itemDelegate()
+*/
+void QAbstractItemView::setItemDelegate(QAbstractItemDelegate *delegate)
+{
+    Q_D(QAbstractItemView);
+    if (delegate == d->itemDelegate)
+        return;
+
+    if (d->itemDelegate) {
+        if (d->delegateRefCount(d->itemDelegate) == 1) {
+            disconnect(d->itemDelegate, SIGNAL(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)),
+                       this, SLOT(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)));
+            disconnect(d->itemDelegate, SIGNAL(commitData(QWidget*)), this, SLOT(commitData(QWidget*)));
+            disconnect(d->itemDelegate, SIGNAL(sizeHintChanged(QModelIndex)), this, SLOT(doItemsLayout()));
+        }
+    }
+
+
+    if (delegate) {
+        if (d->delegateRefCount(delegate) == 0) {
+            connect(delegate, SIGNAL(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)),
+                    this, SLOT(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)));
+            connect(delegate, SIGNAL(commitData(QWidget*)), this, SLOT(commitData(QWidget*)));
+            qRegisterMetaType<QModelIndex>("QModelIndex");
+            connect(delegate, SIGNAL(sizeHintChanged(QModelIndex)), this, SLOT(doItemsLayout()), Qt::QueuedConnection);
+        }
+    }
+    d->itemDelegate = delegate;
+}
+
+/*!
+    Returns the item delegate used by this view and model. This is
+    either one set with setItemDelegate(), or the default one.
+
+    \sa setItemDelegate()
+*/
+QAbstractItemDelegate *QAbstractItemView::itemDelegate() const
+{
+    return d_func()->itemDelegate;
+}
+
+/*!
+    \reimp
+*/
+QVariant QAbstractItemView::inputMethodQuery(Qt::InputMethodQuery query) const
+{
+    const QModelIndex current = currentIndex();
+    if (!current.isValid() || query != Qt::ImMicroFocus)
+        return QAbstractScrollArea::inputMethodQuery(query);
+    return visualRect(current);
+}
+
+/*!
+    \since 4.2
+
+    Sets the given item \a delegate used by this view and model for the given
+    \a row. All items on \a row will be drawn and managed by \a delegate
+    instead of using the default delegate (i.e., itemDelegate()).
+
+    Any existing row delegate for \a row will be removed, but not
+    deleted. QAbstractItemView does not take ownership of \a delegate.
+
+    \note If a delegate has been assigned to both a row and a column, the row
+    delegate (i.e., this delegate) will take presedence and manage the
+    intersecting cell index.
+
+    \warning You should not share the same instance of a delegate between views.
+    Doing so can cause incorrect or unintuitive editing behavior since each
+    view connected to a given delegate may receive the \l{QAbstractItemDelegate::}{closeEditor()}
+    signal, and attempt to access, modify or close an editor that has already been closed.
+
+    \sa itemDelegateForRow(), setItemDelegateForColumn(), itemDelegate()
+*/
+void QAbstractItemView::setItemDelegateForRow(int row, QAbstractItemDelegate *delegate)
+{
+    Q_D(QAbstractItemView);
+    if (QAbstractItemDelegate *rowDelegate = d->rowDelegates.value(row, 0)) {
+        if (d->delegateRefCount(rowDelegate) == 1) {
+            disconnect(rowDelegate, SIGNAL(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)),
+                       this, SLOT(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)));
+            disconnect(rowDelegate, SIGNAL(commitData(QWidget*)), this, SLOT(commitData(QWidget*)));
+        }
+        d->rowDelegates.remove(row);
+    }
+    if (delegate) {
+        if (d->delegateRefCount(delegate) == 0) {
+            connect(delegate, SIGNAL(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)),
+                    this, SLOT(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)));
+            connect(delegate, SIGNAL(commitData(QWidget*)), this, SLOT(commitData(QWidget*)));
+        }
+        d->rowDelegates.insert(row, delegate);
+    }
+}
+
+/*!
+   \since 4.2
+
+   Returns the item delegate used by this view and model for the given \a row,
+   or 0 if no delegate has been assigned. You can call itemDelegate() to get a
+   pointer to the current delegate for a given index.
+
+   \sa setItemDelegateForRow(), itemDelegateForColumn(), setItemDelegate()
+*/
+QAbstractItemDelegate *QAbstractItemView::itemDelegateForRow(int row) const
+{
+    Q_D(const QAbstractItemView);
+    return d->rowDelegates.value(row, 0);
+}
+
+/*!
+    \since 4.2
+
+    Sets the given item \a delegate used by this view and model for the given
+    \a column. All items on \a column will be drawn and managed by \a delegate
+    instead of using the default delegate (i.e., itemDelegate()).
+
+    Any existing column delegate for \a column will be removed, but not
+    deleted. QAbstractItemView does not take ownership of \a delegate.
+
+    \note If a delegate has been assigned to both a row and a column, the row
+    delegate will take presedence and manage the intersecting cell index.
+
+    \warning You should not share the same instance of a delegate between views.
+    Doing so can cause incorrect or unintuitive editing behavior since each
+    view connected to a given delegate may receive the \l{QAbstractItemDelegate::}{closeEditor()}
+    signal, and attempt to access, modify or close an editor that has already been closed.
+
+    \sa itemDelegateForColumn(), setItemDelegateForRow(), itemDelegate()
+*/
+void QAbstractItemView::setItemDelegateForColumn(int column, QAbstractItemDelegate *delegate)
+{
+    Q_D(QAbstractItemView);
+    if (QAbstractItemDelegate *columnDelegate = d->columnDelegates.value(column, 0)) {
+        if (d->delegateRefCount(columnDelegate) == 1) {
+            disconnect(columnDelegate, SIGNAL(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)),
+                       this, SLOT(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)));
+            disconnect(columnDelegate, SIGNAL(commitData(QWidget*)), this, SLOT(commitData(QWidget*)));
+        }
+        d->columnDelegates.remove(column);
+    }
+    if (delegate) {
+        if (d->delegateRefCount(delegate) == 0) {
+            connect(delegate, SIGNAL(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)),
+                    this, SLOT(closeEditor(QWidget*,QAbstractItemDelegate::EndEditHint)));
+            connect(delegate, SIGNAL(commitData(QWidget*)), this, SLOT(commitData(QWidget*)));
+        }
+        d->columnDelegates.insert(column, delegate);
+    }
+}
+
+/*!
+    \since 4.2
+
+    Returns the item delegate used by this view and model for the given \a
+    column.  You can call itemDelegate() to get a pointer to the current delegate
+    for a given index.
+
+    \sa setItemDelegateForColumn(), itemDelegateForRow(), itemDelegate()
+*/
+QAbstractItemDelegate *QAbstractItemView::itemDelegateForColumn(int column) const
+{
+    Q_D(const QAbstractItemView);
+    return d->columnDelegates.value(column, 0);
+}
+
+/*!
+   Returns the item delegate used by this view and model for
+   the given \a index.
+*/
+QAbstractItemDelegate *QAbstractItemView::itemDelegate(const QModelIndex &index) const
+{
+    Q_D(const QAbstractItemView);
+    return d->delegateForIndex(index);
+}
+
+/*!
+  \property QAbstractItemView::selectionMode
+  \brief which selection mode the view operates in
+
+  This property controls whether the user can select one or many items
+  and, in many-item selections, whether the selection must be a
+  continuous range of items.
+
+  \sa SelectionMode SelectionBehavior
+*/
+void QAbstractItemView::setSelectionMode(SelectionMode mode)
+{
+    Q_D(QAbstractItemView);
+    d->selectionMode = mode;
+}
+
+QAbstractItemView::SelectionMode QAbstractItemView::selectionMode() const
+{
+    Q_D(const QAbstractItemView);
+    return d->selectionMode;
+}
+
+/*!
+  \property QAbstractItemView::selectionBehavior
+  \brief which selection behavior the view uses
+
+  This property holds whether selections are done
+  in terms of single items, rows or columns.
+
+  \sa SelectionMode SelectionBehavior
+*/
+
+void QAbstractItemView::setSelectionBehavior(QAbstractItemView::SelectionBehavior behavior)
+{
+    Q_D(QAbstractItemView);
+    d->selectionBehavior = behavior;
+}
+
+QAbstractItemView::SelectionBehavior QAbstractItemView::selectionBehavior() const
+{
+    Q_D(const QAbstractItemView);
+    return d->selectionBehavior;
+}
+
+/*!
+    Sets the current item to be the item at \a index.
+    Depending on the current selection mode, the item may also be selected.
+    Note that this function also updates the starting position for any
+    new selections the user performs.
+
+    To set an item as the current item without selecting it, call
+
+    \c{selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);}
+
+    \sa currentIndex(), currentChanged(), selectionMode
+*/
+void QAbstractItemView::setCurrentIndex(const QModelIndex &index)
+{
+    Q_D(QAbstractItemView);
+    if (d->selectionModel && (!index.isValid() || d->isIndexEnabled(index))) {
+        QItemSelectionModel::SelectionFlags command = selectionCommand(index, 0);
+        d->selectionModel->setCurrentIndex(index, command);
+        d->currentIndexSet = true;
+        if ((command & QItemSelectionModel::Current) == 0)
+            d->pressedPosition = visualRect(currentIndex()).center() + d->offset();
+    }
+}
+
+/*!
+    Returns the model index of the current item.
+
+    \sa setCurrentIndex()
+*/
+QModelIndex QAbstractItemView::currentIndex() const
+{
+    Q_D(const QAbstractItemView);
+    return d->selectionModel ? d->selectionModel->currentIndex() : QModelIndex();
+}
+
+
+/*!
+    Reset the internal state of the view.
+
+    \warning This function will reset open editors, scroll bar positions,
+    selections, etc. Existing changes will not be committed. If you would like
+    to save your changes when resetting the view, you can reimplement this
+    function, commit your changes, and then call the superclass'
+    implementation.
+*/
+void QAbstractItemView::reset()
+{
+    Q_D(QAbstractItemView);
+    QList<QEditorInfo>::const_iterator it = d->editors.constBegin();
+    for (; it != d->editors.constEnd(); ++it)
+        d->releaseEditor(it->editor);
+    d->editors.clear();
+    d->persistent.clear();
+    d->currentIndexSet = false;
+    setState(NoState);
+    setRootIndex(QModelIndex());
+}
+
+/*!
+    Sets the root item to the item at the given \a index.
+
+    \sa rootIndex()
+*/
+void QAbstractItemView::setRootIndex(const QModelIndex &index)
+{
+    Q_D(QAbstractItemView);
+    if (index.isValid() && index.model() != d->model) {
+        qWarning("QAbstractItemView::setRootIndex failed : index must be from the currently set model");
+        return;
+    }
+    d->root = index;
+    d->doDelayedItemsLayout();
+}
+
+/*!
+    Returns the model index of the model's root item. The root item is
+    the parent item to the view's toplevel items. The root can be invalid.
+
+    \sa setRootIndex()
+*/
+QModelIndex QAbstractItemView::rootIndex() const
+{
+    return QModelIndex(d_func()->root);
+}
+
+/*!
+  Selects all item in the view.
+  This function wil use the selection selection behavior
+  set on the view when selecting.
+
+  \sa setSelection(), selectedIndexes(), clearSelection()
+*/
+void QAbstractItemView::selectAll()
+{
+    Q_D(QAbstractItemView);
+    SelectionMode mode = d->selectionMode;
+    if (mode == MultiSelection || mode == ExtendedSelection)
+        d->selectAll(QItemSelectionModel::ClearAndSelect
+                     |d->selectionBehaviorFlags());
+    else if (mode != SingleSelection)
+        d->selectAll(selectionCommand(d->model->index(0, 0, d->root)));
+}
+
+/*!
+    Starts editing the item corresponding to the given \a index if it is
+    editable.
+
+    Note that this function does not change the current index. Since the current
+    index defines the next and previous items to edit, users may find that
+    keyboard navigation does not work as expected. To provide consistent navigation
+    behavior, call setCurrentIndex() before this function with the same model
+    index.
+
+    \sa QModelIndex::flags()
+*/
+void QAbstractItemView::edit(const QModelIndex &index)
+{
+    Q_D(QAbstractItemView);
+    if (!d->isIndexValid(index))
+        qWarning("edit: index was invalid");
+    if (!edit(index, AllEditTriggers, 0))
+        qWarning("edit: editing failed");
+}
+
+/*!
+    Deselects all selected items. The current index will not be changed.
+
+    \sa setSelection(), selectAll()
+*/
+void QAbstractItemView::clearSelection()
+{
+    Q_D(QAbstractItemView);
+    if (d->selectionModel)
+        d->selectionModel->clearSelection();
+}
+
+/*!
+    \internal
+
+    This function is intended to lay out the items in the view.
+    The default implementation just calls updateGeometries() and updates the viewport.
+*/
+void QAbstractItemView::doItemsLayout()
+{
+    Q_D(QAbstractItemView);
+    d->interruptDelayedItemsLayout();
+    updateGeometries();
+    d->viewport->update();
+}
+
+/*!
+    \property QAbstractItemView::editTriggers
+    \brief which actions will initiate item editing
+
+    This property is a selection of flags defined by
+    \l{EditTrigger}, combined using the OR
+    operator. The view will only initiate the editing of an item if the
+    action performed is set in this property.
+*/
+void QAbstractItemView::setEditTriggers(EditTriggers actions)
+{
+    Q_D(QAbstractItemView);
+    d->editTriggers = actions;
+}
+
+QAbstractItemView::EditTriggers QAbstractItemView::editTriggers() const
+{
+    Q_D(const QAbstractItemView);
+    return d->editTriggers;
+}
+
+/*!
+    \since 4.2
+    \property QAbstractItemView::verticalScrollMode
+    \brief how the view scrolls its contents in the vertical direction
+
+    This property controlls how the view scroll its contents vertically.
+    Scrolling can be done either per pixel or per item.
+*/
+
+void QAbstractItemView::setVerticalScrollMode(ScrollMode mode)
+{
+    Q_D(QAbstractItemView);
+    if (mode == d->verticalScrollMode)
+        return;
+    QModelIndex topLeft = indexAt(QPoint(0, 0));
+    d->verticalScrollMode = mode;
+    updateGeometries(); // update the scroll bars
+    scrollTo(topLeft, QAbstractItemView::PositionAtTop);
+}
+
+QAbstractItemView::ScrollMode QAbstractItemView::verticalScrollMode() const
+{
+    Q_D(const QAbstractItemView);
+    return d->verticalScrollMode;
+}
+
+/*!
+    \since 4.2
+    \property QAbstractItemView::horizontalScrollMode
+    \brief how the view scrolls its contents in the horizontal direction
+
+    This property controlls how the view scroll its contents horizontally.
+    Scrolling can be done either per pixel or per item.
+*/
+
+void QAbstractItemView::setHorizontalScrollMode(ScrollMode mode)
+{
+    Q_D(QAbstractItemView);
+    d->horizontalScrollMode = mode;
+    updateGeometries(); // update the scroll bars
+}
+
+QAbstractItemView::ScrollMode QAbstractItemView::horizontalScrollMode() const
+{
+    Q_D(const QAbstractItemView);
+    return d->horizontalScrollMode;
+}
+
+#ifndef QT_NO_DRAGANDDROP
+/*!
+    \since 4.2
+    \property QAbstractItemView::dragDropOverwriteMode
+    \brief the view's drag and drop behavior
+
+    If its value is \c true, the selected data will overwrite the
+    existing item data when dropped, while moving the data will clear
+    the item. If its value is \c false, the selected data will be
+    inserted as a new item when the data is dropped. When the data is
+    moved, the item is removed as well.
+
+    The default value is \c false, as in the QListView and QTreeView
+    subclasses. In the QTableView subclass, on the other hand, the
+    property has been set to \c true.
+
+    Note: This is not intended to prevent overwriting of items.
+    The model's implementation of flags() should do that by not
+    returning Qt::ItemIsDropEnabled.
+
+    \sa dragDropMode
+*/
+void QAbstractItemView::setDragDropOverwriteMode(bool overwrite)
+{
+    Q_D(QAbstractItemView);
+    d->overwrite = overwrite;
+}
+
+bool QAbstractItemView::dragDropOverwriteMode() const
+{
+    Q_D(const QAbstractItemView);
+    return d->overwrite;
+}
+#endif
+
+/*!
+    \property QAbstractItemView::autoScroll
+    \brief whether autoscrolling in drag move events is enabled
+
+    If this property is set to true (the default), the
+    QAbstractItemView automatically scrolls the contents of the view
+    if the user drags within 16 pixels of the viewport edge. If the current
+    item changes, then the view will scroll automatically to ensure that the
+    current item is fully visible.
+
+    This property only works if the viewport accepts drops. Autoscroll is
+    switched off by setting this property to false.
+*/
+
+void QAbstractItemView::setAutoScroll(bool enable)
+{
+    Q_D(QAbstractItemView);
+    d->autoScroll = enable;
+}
+
+bool QAbstractItemView::hasAutoScroll() const
+{
+    Q_D(const QAbstractItemView);
+    return d->autoScroll;
+}
+
+/*!
+    \since 4.4
+    \property QAbstractItemView::autoScrollMargin
+    \brief the size of the area when auto scrolling is triggered
+
+    This property controlls the size of the area at the edge of the viewport that
+    triggers autoscrolling. The default value is 16 pixels.
+*/
+void QAbstractItemView::setAutoScrollMargin(int margin)
+{
+    Q_D(QAbstractItemView);
+    d->autoScrollMargin = margin;
+}
+
+int QAbstractItemView::autoScrollMargin() const
+{
+    Q_D(const QAbstractItemView);
+    return d->autoScrollMargin;
+}
+
+/*!
+  \property QAbstractItemView::tabKeyNavigation
+  \brief whether item navigation with tab and backtab is enabled.
+*/
+
+void QAbstractItemView::setTabKeyNavigation(bool enable)
+{
+    Q_D(QAbstractItemView);
+    d->tabKeyNavigation = enable;
+}
+
+bool QAbstractItemView::tabKeyNavigation() const
+{
+    Q_D(const QAbstractItemView);
+    return d->tabKeyNavigation;
+}
+
+#ifndef QT_NO_DRAGANDDROP
+/*!
+  \property QAbstractItemView::showDropIndicator
+  \brief whether the drop indicator is shown when dragging items and dropping.
+
+  \sa dragEnabled DragDropMode dragDropOverwriteMode acceptDrops
+*/
+
+void QAbstractItemView::setDropIndicatorShown(bool enable)
+{
+    Q_D(QAbstractItemView);
+    d->showDropIndicator = enable;
+}
+
+bool QAbstractItemView::showDropIndicator() const
+{
+    Q_D(const QAbstractItemView);
+    return d->showDropIndicator;
+}
+
+/*!
+  \property QAbstractItemView::dragEnabled
+  \brief whether the view supports dragging of its own items
+
+  \sa showDropIndicator DragDropMode dragDropOverwriteMode acceptDrops
+*/
+
+void QAbstractItemView::setDragEnabled(bool enable)
+{
+    Q_D(QAbstractItemView);
+    d->dragEnabled = enable;
+}
+
+bool QAbstractItemView::dragEnabled() const
+{
+    Q_D(const QAbstractItemView);
+    return d->dragEnabled;
+}
+
+/*!
+    \since 4.2
+    \enum QAbstractItemView::DragDropMode
+
+    Describes the various drag and drop events the view can act upon.
+    By default the view does not support dragging or dropping (\c
+    NoDragDrop).
+
+    \value NoDragDrop Does not support dragging or dropping.
+    \value DragOnly The view supports dragging of its own items
+    \value DropOnly The view accepts drops
+    \value DragDrop The view supports both dragging and dropping
+    \value InternalMove The view accepts move (\bold{not copy}) operations only
+           from itself.
+
+    Note that the model used needs to provide support for drag and drop operations.
+
+    \sa setDragDropMode() {Using Drag and Drop with Item Views}
+*/
+
+/*!
+  \property QAbstractItemView::dragDropMode
+  \brief the drag and drop event the view will act upon
+
+  \since 4.2
+  \sa showDropIndicator dragDropOverwriteMode
+*/
+void QAbstractItemView::setDragDropMode(DragDropMode behavior)
+{
+    Q_D(QAbstractItemView);
+    d->dragDropMode = behavior;
+    setDragEnabled(behavior == DragOnly || behavior == DragDrop || behavior == InternalMove);
+    setAcceptDrops(behavior == DropOnly || behavior == DragDrop || behavior == InternalMove);
+}
+
+QAbstractItemView::DragDropMode QAbstractItemView::dragDropMode() const
+{
+    Q_D(const QAbstractItemView);
+    DragDropMode setBehavior = d->dragDropMode;
+    if (!dragEnabled() && !acceptDrops())
+        return NoDragDrop;
+
+    if (dragEnabled() && !acceptDrops())
+        return DragOnly;
+
+    if (!dragEnabled() && acceptDrops())
+        return DropOnly;
+
+    if (dragEnabled() && acceptDrops()) {
+        if (setBehavior == InternalMove)
+            return setBehavior;
+        else
+            return DragDrop;
+    }
+
+    return NoDragDrop;
+}
+
+#endif // QT_NO_DRAGANDDROP
+
+/*!
+  \property QAbstractItemView::alternatingRowColors
+  \brief whether to draw the background using alternating colors
+
+  If this property is true, the item background will be drawn using
+  QPalette::Base and QPalette::AlternateBase; otherwise the background
+  will be drawn using the QPalette::Base color.
+
+  By default, this property is false.
+*/
+void QAbstractItemView::setAlternatingRowColors(bool enable)
+{
+    Q_D(QAbstractItemView);
+    d->alternatingColors = enable;
+    if (isVisible())
+        d->viewport->update();
+}
+
+bool QAbstractItemView::alternatingRowColors() const
+{
+    Q_D(const QAbstractItemView);
+    return d->alternatingColors;
+}
+
+/*!
+    \property QAbstractItemView::iconSize
+    \brief the size of items' icons
+
+    Setting this property when the view is visible will cause the
+    items to be laid out again.
+*/
+void QAbstractItemView::setIconSize(const QSize &size)
+{
+    Q_D(QAbstractItemView);
+    if (size == d->iconSize)
+        return;
+    d->iconSize = size;
+    d->doDelayedItemsLayout();
+}
+
+QSize QAbstractItemView::iconSize() const
+{
+    Q_D(const QAbstractItemView);
+    return d->iconSize;
+}
+
+/*!
+    \property QAbstractItemView::textElideMode
+
+    \brief the the position of the "..." in elided text.
+
+    The default value for all item views is Qt::ElideRight.
+*/
+void QAbstractItemView::setTextElideMode(Qt::TextElideMode mode)
+{
+    Q_D(QAbstractItemView);
+    d->textElideMode = mode;
+}
+
+Qt::TextElideMode QAbstractItemView::textElideMode() const
+{
+    return d_func()->textElideMode;
+}
+
+/*!
+  \reimp
+*/
+bool QAbstractItemView::focusNextPrevChild(bool next)
+{
+    Q_D(QAbstractItemView);
+    if (d->tabKeyNavigation && isEnabled() && d->viewport->isEnabled()) {
+        QKeyEvent event(QEvent::KeyPress, next ? Qt::Key_Tab : Qt::Key_Backtab, Qt::NoModifier);
+        keyPressEvent(&event);
+        if (event.isAccepted())
+            return true;
+    }
+    return QAbstractScrollArea::focusNextPrevChild(next);
+}
+
+/*!
+  \reimp
+*/
+bool QAbstractItemView::event(QEvent *event)
+{
+    Q_D(QAbstractItemView);
+    switch (event->type()) {
+    case QEvent::Paint:
+        //we call this here because the scrollbars' visibility might be altered
+        //so this can't be done in the paintEvent method
+        d->executePostedLayout(); //make sure we set the layout properly
+        break;
+    case QEvent::Show:
+        {
+            d->executePostedLayout(); //make sure we set the layout properly
+            const QModelIndex current = currentIndex();
+            if (current.isValid() && (d->state == QAbstractItemView::EditingState || d->autoScroll))
+                scrollTo(current);
+        }
+        break;
+    case QEvent::LocaleChange:
+        viewport()->update();
+        break;
+    case QEvent::LayoutDirectionChange:
+    case QEvent::ApplicationLayoutDirectionChange:
+        updateGeometries();
+        break;
+    case QEvent::StyleChange:
+        doItemsLayout();
+        break;
+    case QEvent::FocusOut:
+        d->checkPersistentEditorFocus();
+        break;
+    default:
+        break;
+    }
+    return QAbstractScrollArea::event(event);
+}
+
+/*!
+    \fn bool QAbstractItemView::viewportEvent(QEvent *event)
+
+    This function is used to handle tool tips, and What's
+    This? mode, if the given \a event is a QEvent::ToolTip,or a
+    QEvent::WhatsThis. It passes all other
+    events on to its base class viewportEvent() handler.
+*/
+bool QAbstractItemView::viewportEvent(QEvent *event)
+{
+    Q_D(QAbstractItemView);
+    switch (event->type()) {
+    case QEvent::HoverEnter: {
+        QHoverEvent *he = static_cast<QHoverEvent*>(event);
+        d->hover = indexAt(he->pos());
+        d->viewport->update(visualRect(d->hover));
+        break; }
+    case QEvent::HoverLeave: {
+        d->viewport->update(visualRect(d->hover)); // update old
+        d->hover = QModelIndex();
+        break; }
+    case QEvent::HoverMove: {
+        QHoverEvent *he = static_cast<QHoverEvent*>(event);
+        QModelIndex old = d->hover;
+        d->hover = indexAt(he->pos());
+        if (d->hover != old)
+            d->viewport->update(visualRect(old)|visualRect(d->hover));
+        break; }
+    case QEvent::Enter:
+        d->viewportEnteredNeeded = true;
+        break;
+    case QEvent::Leave:
+        d->enteredIndex = QModelIndex();
+        break;
+    case QEvent::ToolTip:
+    case QEvent::QueryWhatsThis:
+    case QEvent::WhatsThis: {
+        QHelpEvent *he = static_cast<QHelpEvent*>(event);
+        const QModelIndex index = indexAt(he->pos());
+        QStyleOptionViewItemV4 option = d->viewOptionsV4();
+        option.rect = visualRect(index);
+        option.state |= (index == currentIndex() ? QStyle::State_HasFocus : QStyle::State_None);
+        bool retval = false;
+        // ### Qt 5: make this a normal function call to a virtual function
+        QMetaObject::invokeMethod(d->delegateForIndex(index), "helpEvent",
+                                  Q_RETURN_ARG(bool, retval),
+                                  Q_ARG(QHelpEvent *, he),
+                                  Q_ARG(QAbstractItemView *, this),
+                                  Q_ARG(QStyleOptionViewItem, option),
+                                  Q_ARG(QModelIndex, index));
+        return retval;
+    }
+    case QEvent::FontChange:
+        d->doDelayedItemsLayout(); // the size of the items will change
+        break;
+    case QEvent::WindowActivate:
+    case QEvent::WindowDeactivate:
+        d->viewport->update();
+        break;
+    default:
+        break;
+    }
+    return QAbstractScrollArea::viewportEvent(event);
+}
+
+/*!
+    This function is called with the given \a event when a mouse button is pressed
+    while the cursor is inside the widget. If a valid item is pressed on it is made
+    into the current item. This function emits the pressed() signal.
+*/
+void QAbstractItemView::mousePressEvent(QMouseEvent *event)
+{
+    Q_D(QAbstractItemView);
+    d->delayedAutoScroll.stop(); //any interaction with the view cancel the auto scrolling
+    QPoint pos = event->pos();
+    QPersistentModelIndex index = indexAt(pos);
+
+    if (!d->selectionModel
+        || (d->state == EditingState && d->hasEditor(index)))
+        return;
+
+    d->pressedAlreadySelected = d->selectionModel->isSelected(index);
+    d->pressedIndex = index;
+    d->pressedModifiers = event->modifiers();
+    QItemSelectionModel::SelectionFlags command = selectionCommand(index, event);
+    QPoint offset = d->offset();
+    if ((command & QItemSelectionModel::Current) == 0)
+        d->pressedPosition = pos + offset;
+
+    if (d->pressedPosition == QPoint(-1, -1))
+        d->pressedPosition = visualRect(currentIndex()).center() + offset;
+
+    if (edit(index, NoEditTriggers, event))
+        return;
+
+    if (index.isValid() && d->isIndexEnabled(index)) {
+        // we disable scrollTo for mouse press so the item doesn't change position
+        // when the user is interacting with it (ie. clicking on it)
+        bool autoScroll = d->autoScroll;
+        d->autoScroll = false;
+        d->selectionModel->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
+        d->autoScroll = autoScroll;
+        QRect rect(d->pressedPosition - offset, pos);
+        setSelection(rect, command);
+
+        // signal handlers may change the model
+        emit pressed(index);
+        if (d->autoScroll) {
+            //we delay the autoscrolling to filter out double click event
+            //100 is to be sure that there won't be a double-click misinterpreted as a 2 single clicks
+            d->delayedAutoScroll.start(QApplication::doubleClickInterval()+100, this);
+        }
+
+    } else {
+        // Forces a finalize() even if mouse is pressed, but not on a item
+        d->selectionModel->select(QModelIndex(), QItemSelectionModel::Select);
+    }
+}
+
+/*!
+    This function is called with the given \a event when a mouse move event is
+    sent to the widget. If a selection is in progress and new items are moved
+    over the selection is extended; if a drag is in progress it is continued.
+*/
+void QAbstractItemView::mouseMoveEvent(QMouseEvent *event)
+{
+    Q_D(QAbstractItemView);
+    QPoint topLeft;
+    QPoint bottomRight = event->pos();
+
+    if (state() == ExpandingState || state() == CollapsingState)
+        return;
+
+#ifndef QT_NO_DRAGANDDROP
+    if (state() == DraggingState) {
+        topLeft = d->pressedPosition - d->offset();
+        if ((topLeft - bottomRight).manhattanLength() > QApplication::startDragDistance()) {
+            d->pressedIndex = QModelIndex();
+            startDrag(d->model->supportedDragActions());
+            setState(NoState); // the startDrag will return when the dnd operation is done
+            stopAutoScroll();
+        }
+        return;
+    }
+#endif // QT_NO_DRAGANDDROP
+
+    QModelIndex index = indexAt(bottomRight);
+    QModelIndex buddy = d->model->buddy(d->pressedIndex);
+    if ((state() == EditingState && d->hasEditor(buddy))
+        || edit(index, NoEditTriggers, event))
+        return;
+
+    if (d->selectionMode != SingleSelection)
+        topLeft = d->pressedPosition - d->offset();
+    else
+        topLeft = bottomRight;
+
+    if (d->viewportEnteredNeeded || d->enteredIndex != index) {
+        d->viewportEnteredNeeded = false;
+
+        // signal handlers may change the model
+        QPersistentModelIndex persistent = index;
+        if (persistent.isValid()) {
+            emit entered(persistent);
+#ifndef QT_NO_STATUSTIP
+            QString statustip = d->model->data(persistent, Qt::StatusTipRole).toString();
+            if (parent() && !statustip.isEmpty()) {
+                QStatusTipEvent tip(statustip);
+                QApplication::sendEvent(parent(), &tip);
+            }
+#endif
+        } else {
+#ifndef QT_NO_STATUSTIP
+            if (parent()) {
+                QString emptyString;
+                QStatusTipEvent tip(emptyString);
+                QApplication::sendEvent(parent(), &tip);
+            }
+#endif
+            emit viewportEntered();
+        }
+        d->enteredIndex = persistent;
+        index = persistent;
+    }
+
+#ifndef QT_NO_DRAGANDDROP
+    if (index.isValid()
+        && d->dragEnabled
+        && (state() != DragSelectingState)
+        && (event->buttons() != Qt::NoButton)
+        && !d->selectedDraggableIndexes().isEmpty()) {
+            setState(DraggingState);
+            return;
+    }
+#endif
+
+    if ((event->buttons() & Qt::LeftButton) && d->selectionAllowed(index) && d->selectionModel) {
+        setState(DragSelectingState);
+        QItemSelectionModel::SelectionFlags command = selectionCommand(index, event);
+
+        // Do the normalize ourselves, since QRect::normalized() is flawed
+        QRect selectionRect = QRect(topLeft, bottomRight);
+        QPersistentModelIndex persistent = index;
+        setSelection(selectionRect, command);
+
+        // set at the end because it might scroll the view
+        if (persistent.isValid()
+            && (persistent != d->selectionModel->currentIndex())
+            && d->isIndexEnabled(persistent))
+            d->selectionModel->setCurrentIndex(persistent, QItemSelectionModel::NoUpdate);
+    }
+}
+
+/*!
+    This function is called with the given \a event when a mouse button is released,
+    after a mouse press event on the widget. If a user presses the mouse inside your
+    widget and then drags the mouse to another location before releasing the mouse button,
+    your widget receives the release event. The function will emit the clicked() signal if an
+    item was being pressed.
+*/
+void QAbstractItemView::mouseReleaseEvent(QMouseEvent *event)
+{
+    Q_D(QAbstractItemView);
+
+    QPoint pos = event->pos();
+    QPersistentModelIndex index = indexAt(pos);
+
+    if (state() == EditingState) {
+        if (d->isIndexValid(index)
+            && d->isIndexEnabled(index)
+            && d->sendDelegateEvent(index, event))
+            d->viewport->update(visualRect(index));
+        return;
+    }
+
+    bool click = (index == d->pressedIndex && index.isValid());
+    bool selectedClicked = click && (event->button() & Qt::LeftButton) && d->pressedAlreadySelected;
+    EditTrigger trigger = (selectedClicked ? SelectedClicked : NoEditTriggers);
+    bool edited = edit(index, trigger, event);
+
+    if (d->selectionModel)
+        d->selectionModel->select(index, selectionCommand(index, event));
+
+    setState(NoState);
+
+    if (click) {
+        emit clicked(index);
+        if (edited)
+            return;
+        if (style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, 0, this))
+            emit activated(index);
+    }
+}
+
+/*!
+    This function is called with the given \a event when a mouse button is
+    double clicked inside the widget. If the double-click is on a valid item it
+    emits the doubleClicked() signal and calls edit() on the item.
+*/
+void QAbstractItemView::mouseDoubleClickEvent(QMouseEvent *event)
+{
+    Q_D(QAbstractItemView);
+
+    QModelIndex index = indexAt(event->pos());
+    if (!index.isValid()
+        || !d->isIndexEnabled(index)
+        || (d->pressedIndex != index)) {
+        QMouseEvent me(QEvent::MouseButtonPress,
+                       event->pos(), event->button(),
+                       event->buttons(), event->modifiers());
+        mousePressEvent(&me);
+        return;
+    }
+    // signal handlers may change the model
+    QPersistentModelIndex persistent = index;
+    emit doubleClicked(persistent);
+    if ((event->button() & Qt::LeftButton) && !edit(persistent, DoubleClicked, event)
+        && !style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, 0, this))
+        emit activated(persistent);
+}
+
+#ifndef QT_NO_DRAGANDDROP
+
+/*!
+    This function is called with the given \a event when a drag and drop operation enters
+    the widget. If the drag is over a valid dropping place (e.g. over an item that
+    accepts drops), the event is accepted; otherwise it is ignored.
+
+    \sa dropEvent() startDrag()
+*/
+void QAbstractItemView::dragEnterEvent(QDragEnterEvent *event)
+{
+    if (dragDropMode() == InternalMove
+        && (event->source() != this|| !(event->possibleActions() & Qt::MoveAction)))
+        return;
+
+    if (d_func()->canDecode(event)) {
+        event->accept();
+        setState(DraggingState);
+    } else {
+        event->ignore();
+    }
+}
+
+/*!
+    This function is called continuously with the given \a event during a drag and
+    drop operation over the widget. It can cause the view to scroll if, for example,
+    the user drags a selection to view's right or bottom edge. In this case, the
+    event will be accepted; otherwise it will be ignored.
+
+    \sa dropEvent() startDrag()
+*/
+void QAbstractItemView::dragMoveEvent(QDragMoveEvent *event)
+{
+    Q_D(QAbstractItemView);
+    if (dragDropMode() == InternalMove
+        && (event->source() != this || !(event->possibleActions() & Qt::MoveAction)))
+        return;
+
+    // ignore by default
+    event->ignore();
+
+    QModelIndex index = indexAt(event->pos());
+    d->hover = index;
+    if (!d->droppingOnItself(event, index)
+        && d->canDecode(event)) {
+
+        if (index.isValid() && d->showDropIndicator) {
+            QRect rect = visualRect(index);
+            d->dropIndicatorPosition = d->position(event->pos(), rect, index);
+            switch (d->dropIndicatorPosition) {
+            case AboveItem:
+                if (d->isIndexDropEnabled(index.parent())) {
+                    d->dropIndicatorRect = QRect(rect.left(), rect.top(), rect.width(), 0);
+                    event->accept();
+                } else {
+                    d->dropIndicatorRect = QRect();
+                }
+                break;
+            case BelowItem:
+                if (d->isIndexDropEnabled(index.parent())) {
+                    d->dropIndicatorRect = QRect(rect.left(), rect.bottom(), rect.width(), 0);
+                    event->accept();
+                } else {
+                    d->dropIndicatorRect = QRect();
+                }
+                break;
+            case OnItem:
+                if (d->isIndexDropEnabled(index)) {
+                    d->dropIndicatorRect = rect;
+                    event->accept();
+                } else {
+                    d->dropIndicatorRect = QRect();
+                }
+                break;
+            case OnViewport:
+                d->dropIndicatorRect = QRect();
+                if (d->isIndexDropEnabled(rootIndex())) {
+                    event->accept(); // allow dropping in empty areas
+                }
+                break;
+            }
+        } else {
+            d->dropIndicatorRect = QRect();
+            d->dropIndicatorPosition = OnViewport;
+            if (d->isIndexDropEnabled(rootIndex())) {
+                event->accept(); // allow dropping in empty areas
+            }
+        }
+        d->viewport->update();
+    } // can decode
+
+    if (d->shouldAutoScroll(event->pos()))
+        startAutoScroll();
+}
+
+/*!
+    \internal
+    Return true if this is a move from ourself and \a index is a child of the selection that
+    is being moved.
+ */
+bool QAbstractItemViewPrivate::droppingOnItself(QDropEvent *event, const QModelIndex &index)
+{
+    Q_Q(QAbstractItemView);
+    Qt::DropAction dropAction = event->dropAction();
+    if (q->dragDropMode() == QAbstractItemView::InternalMove)
+        dropAction = Qt::MoveAction;
+    if (event->source() == q
+        && event->possibleActions() & Qt::MoveAction
+        && dropAction == Qt::MoveAction) {
+        QModelIndexList selectedIndexes = q->selectedIndexes();
+        QModelIndex child = index;
+        while (child.isValid() && child != root) {
+            if (selectedIndexes.contains(child))
+                return true;
+            child = child.parent();
+        }
+    }
+    return false;
+}
+
+/*!
+    \fn void QAbstractItemView::dragLeaveEvent(QDragLeaveEvent *event)
+
+    This function is called when the item being dragged leaves the view.
+    The \a event describes the state of the drag and drop operation.
+*/
+void QAbstractItemView::dragLeaveEvent(QDragLeaveEvent *)
+{
+    Q_D(QAbstractItemView);
+    stopAutoScroll();
+    setState(NoState);
+    d->hover = QModelIndex();
+    d->viewport->update();
+}
+
+/*!
+    This function is called with the given \a event when a drop event occurs over
+    the widget. If the model accepts the even position the drop event is accepted;
+    otherwise it is ignored.
+
+    \sa startDrag()
+*/
+void QAbstractItemView::dropEvent(QDropEvent *event)
+{
+    Q_D(QAbstractItemView);
+    if (dragDropMode() == InternalMove) {
+        if (event->source() != this || !(event->possibleActions() & Qt::MoveAction))
+            return;
+    }
+
+    QModelIndex index;
+    int col = -1;
+    int row = -1;
+    if (d->dropOn(event, &row, &col, &index)) {
+        if (d->model->dropMimeData(event->mimeData(),
+            dragDropMode() == InternalMove ? Qt::MoveAction : event->dropAction(), row, col, index)) {
+                if (dragDropMode() == InternalMove)
+                    event->setDropAction(Qt::MoveAction);
+                event->accept();
+        }
+    }
+    stopAutoScroll();
+    setState(NoState);
+    d->viewport->update();
+}
+
+/*!
+    If the event hasn't already been accepted, determines the index to drop on.
+
+    if (row == -1 && col == -1)
+        // append to this drop index
+    else
+        // place at row, col in drop index
+
+    If it returns true a drop can be done, and dropRow, dropCol and dropIndex reflects the position of the drop.
+    \internal
+  */
+bool QAbstractItemViewPrivate::dropOn(QDropEvent *event, int *dropRow, int *dropCol, QModelIndex *dropIndex)
+{
+    Q_Q(QAbstractItemView);
+    if (event->isAccepted())
+        return false;
+
+    QModelIndex index;
+    // rootIndex() (i.e. the viewport) might be a valid index
+    if (viewport->rect().contains(event->pos())) {
+        index = q->indexAt(event->pos());
+        if (!index.isValid() || !q->visualRect(index).contains(event->pos()))
+            index = root;
+    }
+
+    // If we are allowed to do the drop
+    if (model->supportedDropActions() & event->dropAction()) {
+        int row = -1;
+        int col = -1;
+        if (index != root) {
+            dropIndicatorPosition = position(event->pos(), q->visualRect(index), index);
+            switch (dropIndicatorPosition) {
+            case QAbstractItemView::AboveItem:
+                row = index.row();
+                col = index.column();
+                index = index.parent();
+                break;
+            case QAbstractItemView::BelowItem:
+                row = index.row() + 1;
+                col = index.column();
+                index = index.parent();
+                break;
+            case QAbstractItemView::OnItem:
+            case QAbstractItemView::OnViewport:
+                break;
+            }
+        } else {
+            dropIndicatorPosition = QAbstractItemView::OnViewport;
+        }
+        *dropIndex = index;
+        *dropRow = row;
+        *dropCol = col;
+        if (!droppingOnItself(event, index))
+            return true;
+    }
+    return false;
+}
+
+QAbstractItemView::DropIndicatorPosition
+QAbstractItemViewPrivate::position(const QPoint &pos, const QRect &rect, const QModelIndex &index) const
+{
+    QAbstractItemView::DropIndicatorPosition r = QAbstractItemView::OnViewport;
+    if (!overwrite) {
+        const int margin = 2;
+        if (pos.y() - rect.top() < margin) {
+            r = QAbstractItemView::AboveItem;
+        } else if (rect.bottom() - pos.y() < margin) {
+            r = QAbstractItemView::BelowItem;
+        } else if (rect.contains(pos, true)) {
+            r = QAbstractItemView::OnItem;
+        }
+    } else {
+        QRect touchingRect = rect;
+        touchingRect.adjust(-1, -1, 1, 1);
+        if (touchingRect.contains(pos, false)) {
+            r = QAbstractItemView::OnItem;
+        }
+    }
+
+    if (r == QAbstractItemView::OnItem && (!(model->flags(index) & Qt::ItemIsDropEnabled)))
+        r = pos.y() < rect.center().y() ? QAbstractItemView::AboveItem : QAbstractItemView::BelowItem;
+
+    return r;
+}
+
+#endif // QT_NO_DRAGANDDROP
+
+/*!
+    This function is called with the given \a event when the widget obtains the focus.
+    By default, the event is ignored.
+
+    \sa setFocus(), focusOutEvent()
+*/
+void QAbstractItemView::focusInEvent(QFocusEvent *event)
+{
+    Q_D(QAbstractItemView);
+    QAbstractScrollArea::focusInEvent(event);
+    if (selectionModel()
+        && !d->currentIndexSet
+        && !currentIndex().isValid()) {
+        bool autoScroll = d->autoScroll;
+        d->autoScroll = false;
+        QModelIndex index = moveCursor(MoveNext, Qt::NoModifier); // first visible index
+        if (index.isValid() && d->isIndexEnabled(index))
+            selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
+        d->autoScroll = autoScroll;
+    }
+    d->viewport->update();
+}
+
+/*!
+    This function is called with the given \a event when the widget
+    looses the focus. By default, the event is ignored.
+
+    \sa clearFocus(), focusInEvent()
+*/
+void QAbstractItemView::focusOutEvent(QFocusEvent *event)
+{
+    Q_D(QAbstractItemView);
+    QAbstractScrollArea::focusOutEvent(event);
+    d->viewport->update();
+}
+
+/*!
+    This function is called with the given \a event when a key event is sent to
+    the widget. The default implementation handles basic cursor movement, e.g. Up,
+    Down, Left, Right, Home, PageUp, and PageDown; the activated() signal is
+    emitted if the current index is valid and the activation key is pressed
+    (e.g. Enter or Return, depending on the platform).
+    This function is where editing is initiated by key press, e.g. if F2 is
+    pressed.
+
+    \sa edit(), moveCursor(), keyboardSearch(), tabKeyNavigation
+*/
+void QAbstractItemView::keyPressEvent(QKeyEvent *event)
+{
+    Q_D(QAbstractItemView);
+    d->delayedAutoScroll.stop(); //any interaction with the view cancel the auto scrolling
+
+#ifdef QT_KEYPAD_NAVIGATION
+    switch (event->key()) {
+    case Qt::Key_Select:
+        if (QApplication::keypadNavigationEnabled()) {
+            if (!hasEditFocus()) {
+                setEditFocus(true);
+                return;
+            }
+        }
+        break;
+    case Qt::Key_Back:
+        if (QApplication::keypadNavigationEnabled() && hasEditFocus())
+            setEditFocus(false);
+        else
+            event->ignore();
+        return;
+    default:
+        if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {
+            event->ignore();
+            return;
+        }
+    }
+#endif
+
+#if !defined(QT_NO_CLIPBOARD) && !defined(QT_NO_SHORTCUT)
+    if (event == QKeySequence::Copy) {
+        QVariant variant;
+        if (d->model)
+            variant = d->model->data(currentIndex(), Qt::DisplayRole);
+        if (variant.type() == QVariant::String)
+            QApplication::clipboard()->setText(variant.toString());
+        event->accept();
+    }
+#endif
+
+    QPersistentModelIndex newCurrent;
+    switch (event->key()) {
+    case Qt::Key_Down:
+        newCurrent = moveCursor(MoveDown, event->modifiers());
+        break;
+    case Qt::Key_Up:
+        newCurrent = moveCursor(MoveUp, event->modifiers());
+        break;
+    case Qt::Key_Left:
+        newCurrent = moveCursor(MoveLeft, event->modifiers());
+        break;
+    case Qt::Key_Right:
+        newCurrent = moveCursor(MoveRight, event->modifiers());
+        break;
+    case Qt::Key_Home:
+        newCurrent = moveCursor(MoveHome, event->modifiers());
+        break;
+    case Qt::Key_End:
+        newCurrent = moveCursor(MoveEnd, event->modifiers());
+        break;
+    case Qt::Key_PageUp:
+        newCurrent = moveCursor(MovePageUp, event->modifiers());
+        break;
+    case Qt::Key_PageDown:
+        newCurrent = moveCursor(MovePageDown, event->modifiers());
+        break;
+    case Qt::Key_Tab:
+        if (d->tabKeyNavigation)
+            newCurrent = moveCursor(MoveNext, event->modifiers());
+        break;
+    case Qt::Key_Backtab:
+        if (d->tabKeyNavigation)
+            newCurrent = moveCursor(MovePrevious, event->modifiers());
+        break;
+    }
+
+    QPersistentModelIndex oldCurrent = currentIndex();
+    if (newCurrent != oldCurrent && newCurrent.isValid() && d->isIndexEnabled(newCurrent)) {
+        if (!hasFocus() && QApplication::focusWidget() == indexWidget(oldCurrent))
+            setFocus();
+        QItemSelectionModel::SelectionFlags command = selectionCommand(newCurrent, event);
+        if (command != QItemSelectionModel::NoUpdate
+             || style()->styleHint(QStyle::SH_ItemView_MovementWithoutUpdatingSelection, 0, this)) {
+            // note that we don't check if the new current index is enabled because moveCursor() makes sure it is
+            if (command & QItemSelectionModel::Current) {
+                d->selectionModel->setCurrentIndex(newCurrent, QItemSelectionModel::NoUpdate);
+                if (d->pressedPosition == QPoint(-1, -1))
+                    d->pressedPosition = visualRect(oldCurrent).center();
+                QRect rect(d->pressedPosition - d->offset(), visualRect(newCurrent).center());
+                setSelection(rect, command);
+            } else {
+                d->selectionModel->setCurrentIndex(newCurrent, command);
+                d->pressedPosition = visualRect(newCurrent).center() + d->offset();
+            }
+            return;
+        }
+    }
+
+    switch (event->key()) {
+    // ignored keys
+    case Qt::Key_Down:
+    case Qt::Key_Up:
+#ifdef QT_KEYPAD_NAVIGATION
+        if (QApplication::keypadNavigationEnabled()) {
+            event->accept(); // don't change focus
+            break;
+        }
+#endif
+    case Qt::Key_Left:
+    case Qt::Key_Right:
+    case Qt::Key_Home:
+    case Qt::Key_End:
+    case Qt::Key_PageUp:
+    case Qt::Key_PageDown:
+    case Qt::Key_Escape:
+    case Qt::Key_Shift:
+    case Qt::Key_Control:
+        event->ignore();
+        break;
+    case Qt::Key_Space:
+    case Qt::Key_Select:
+        if (!edit(currentIndex(), AnyKeyPressed, event) && d->selectionModel)
+            d->selectionModel->select(currentIndex(), selectionCommand(currentIndex(), event));
+#ifdef QT_KEYPAD_NAVIGATION
+        if ( event->key()==Qt::Key_Select ) {
+            // Also do Key_Enter action.
+            if (currentIndex().isValid()) {
+                if (state() != EditingState)
+                    emit activated(currentIndex());
+            } else {
+                event->ignore();
+            }
+        }
+#endif
+        break;
+#ifdef Q_WS_MAC
+    case Qt::Key_Enter:
+    case Qt::Key_Return:
+        // Propagate the enter if you couldn't edit the item and there are no
+        // current editors (if there are editors, the event was most likely propagated from it).
+        if (!edit(currentIndex(), EditKeyPressed, event) && d->editors.isEmpty())
+            event->ignore();
+        break;
+#else
+    case Qt::Key_F2:
+        if (!edit(currentIndex(), EditKeyPressed, event))
+            event->ignore();
+        break;
+    case Qt::Key_Enter:
+    case Qt::Key_Return:
+        // ### we can't open the editor on enter, becuse
+        // some widgets will forward the enter event back
+        // to the viewport, starting an endless loop
+        if (state() != EditingState || hasFocus()) {
+            if (currentIndex().isValid())
+                emit activated(currentIndex());
+            event->ignore();
+        }
+        break;
+#endif
+    case Qt::Key_A:
+        if (event->modifiers() & Qt::ControlModifier) {
+            selectAll();
+            break;
+        }
+    default: {
+#ifdef Q_WS_MAC
+        if (event->key() == Qt::Key_O && event->modifiers() & Qt::ControlModifier && currentIndex().isValid()) {
+            emit activated(currentIndex());
+            break;
+        }
+#endif
+        bool modified = (event->modifiers() & (Qt::ControlModifier | Qt::AltModifier | Qt::MetaModifier));
+        if (!event->text().isEmpty() && !modified) {
+            if (!edit(currentIndex(), AnyKeyPressed, event))
+                keyboardSearch(event->text());
+        }
+        event->ignore();
+        break; }
+    }
+}
+
+/*!
+    This function is called with the given \a event when a resize event is sent to
+    the widget.
+
+    \sa QWidget::resizeEvent()
+*/
+void QAbstractItemView::resizeEvent(QResizeEvent *event)
+{
+    QAbstractScrollArea::resizeEvent(event);
+    updateGeometries();
+}
+
+/*!
+  This function is called with the given \a event when a timer event is sent
+  to the widget.
+
+  \sa QObject::timerEvent()
+*/
+void QAbstractItemView::timerEvent(QTimerEvent *event)
+{
+    Q_D(QAbstractItemView);
+    if (event->timerId() == d->autoScrollTimer.timerId())
+        doAutoScroll();
+    else if (event->timerId() == d->updateTimer.timerId())
+        d->updateDirtyRegion();
+    else if (event->timerId() == d->delayedEditing.timerId()) {
+        d->delayedEditing.stop();
+        edit(currentIndex());
+    } else if (event->timerId() == d->delayedLayout.timerId()) {
+        d->delayedLayout.stop();
+        if (isVisible()) {
+            d->interruptDelayedItemsLayout();
+            doItemsLayout();
+            const QModelIndex current = currentIndex();
+            if (current.isValid() && d->state == QAbstractItemView::EditingState)
+                scrollTo(current);
+        }
+    } else if (event->timerId() == d->delayedAutoScroll.timerId()) {
+        d->delayedAutoScroll.stop();
+        //end of the timer: if the current item is still the same as the one when the mouse press occurred
+        //we only get here if there was no double click
+        if (d->pressedIndex.isValid() && d->pressedIndex == currentIndex())
+            scrollTo(d->pressedIndex);
+    }
+}
+
+/*!
+    \reimp
+*/
+void QAbstractItemView::inputMethodEvent(QInputMethodEvent *event)
+{
+    if (event->commitString().isEmpty() && event->preeditString().isEmpty()) {
+        event->ignore();
+        return;
+    }
+    if (!edit(currentIndex(), AnyKeyPressed, event)) {
+        if (!event->commitString().isEmpty())
+            keyboardSearch(event->commitString());
+        event->ignore();
+    }
+}
+
+#ifndef QT_NO_DRAGANDDROP
+/*!
+    \enum QAbstractItemView::DropIndicatorPosition
+
+    This enum indicates the position of the drop indicator in
+    relation to the index at the current mouse position:
+
+    \value OnItem  The item will be dropped on the index.
+
+    \value AboveItem  The item will be dropped above the index.
+
+    \value BelowItem  The item will be dropped below the index.
+
+    \value OnViewport  The item will be dropped onto a region of the viewport with
+no items. The way each view handles items dropped onto the viewport depends on
+the behavior of the underlying model in use.
+*/
+
+
+/*!
+    \since 4.1
+
+    Returns the position of the drop indicator in relation to the closest item.
+*/
+QAbstractItemView::DropIndicatorPosition QAbstractItemView::dropIndicatorPosition() const
+{
+    Q_D(const QAbstractItemView);
+    return d->dropIndicatorPosition;
+}
+#endif
+
+/*!
+  This convenience function returns a list of all selected and
+  non-hidden item indexes in the view. The list contains no
+  duplicates, and is not sorted.
+
+  \sa QItemSelectionModel::selectedIndexes()
+*/
+QModelIndexList QAbstractItemView::selectedIndexes() const
+{
+    Q_D(const QAbstractItemView);
+    QModelIndexList indexes;
+    if (d->selectionModel) {
+        indexes = d->selectionModel->selectedIndexes();
+        QList<QModelIndex>::iterator it = indexes.begin();
+        while (it != indexes.end())
+            if (isIndexHidden(*it))
+                it = indexes.erase(it);
+            else
+                ++it;
+    }
+    return indexes;
+}
+
+/*!
+    Starts editing the item at \a index, creating an editor if
+    necessary, and returns true if the view's \l{State} is now
+    EditingState; otherwise returns false.
+
+    The action that caused the editing process is described by
+    \a trigger, and the associated event is specified by \a event.
+
+    Editing can be forced by specifying the \a trigger to be
+    QAbstractItemView::AllEditTriggers.
+
+    \sa closeEditor()
+*/
+bool QAbstractItemView::edit(const QModelIndex &index, EditTrigger trigger, QEvent *event)
+{
+    Q_D(QAbstractItemView);
+
+    if (!d->isIndexValid(index))
+        return false;
+
+    if (QWidget *w = (d->persistent.isEmpty() ? static_cast<QWidget*>(0) : d->editorForIndex(index).editor.data())) {
+        if (w->focusPolicy() == Qt::NoFocus)
+            return false;
+        w->setFocus();
+        return true;
+    }
+
+    if (trigger == DoubleClicked) {
+        d->delayedEditing.stop();
+        d->delayedAutoScroll.stop();
+    } else if (trigger == CurrentChanged) {
+        d->delayedEditing.stop();
+    }
+
+    if (d->sendDelegateEvent(index, event)) {
+        d->viewport->update(visualRect(index));
+        return true;
+    }
+
+    // save the previous trigger before updating
+    EditTriggers lastTrigger = d->lastTrigger;
+    d->lastTrigger = trigger;
+
+    if (!d->shouldEdit(trigger, d->model->buddy(index)))
+        return false;
+
+    if (d->delayedEditing.isActive())
+        return false;
+
+    // we will receive a mouseButtonReleaseEvent after a
+    // mouseDoubleClickEvent, so we need to check the previous trigger
+    if (lastTrigger == DoubleClicked && trigger == SelectedClicked)
+        return false;
+
+    // we may get a double click event later
+    if (trigger == SelectedClicked)
+        d->delayedEditing.start(QApplication::doubleClickInterval(), this);
+    else
+        d->openEditor(index, d->shouldForwardEvent(trigger, event) ? event : 0);
+
+    return true;
+}
+
+/*!
+  \internal
+  Updates the data shown in the open editor widgets in the view.
+*/
+void QAbstractItemView::updateEditorData()
+{
+    Q_D(QAbstractItemView);
+    d->updateEditorData(QModelIndex(), QModelIndex());
+}
+
+/*!
+  \internal
+   Updates the geometry of the open editor widgets in the view.
+*/
+void QAbstractItemView::updateEditorGeometries()
+{
+    Q_D(QAbstractItemView);
+    if(d->editors.isEmpty())
+        return;
+    QStyleOptionViewItemV4 option = d->viewOptionsV4();
+    QList<QEditorInfo>::iterator it = d->editors.begin();
+    QWidgetList editorsToRelease;
+    while (it != d->editors.end()) {
+        QModelIndex index = it->index;
+        QWidget *editor = it->editor;
+        if (index.isValid() && editor) {
+            option.rect = visualRect(index);
+            if (option.rect.isValid()) {
+                editor->show();
+                QAbstractItemDelegate *delegate = d->delegateForIndex(index);
+                if (delegate)
+                    delegate->updateEditorGeometry(editor, option, index);
+            } else {
+                editor->hide();
+            }
+            ++it;
+        } else {
+            it = d->editors.erase(it);
+            editorsToRelease << editor;
+        }
+    }
+
+    //we release the editor outside of the loop because it might change the focus and try
+    //to change the d->editors list.
+    foreach(QWidget *editor, editorsToRelease) {
+        d->releaseEditor(editor);
+    }
+}
+
+/*!
+    \since 4.4
+
+    Updates the geometry of the child widgets of the view.
+*/
+void QAbstractItemView::updateGeometries()
+{
+    updateEditorGeometries();
+    QMetaObject::invokeMethod(this, "_q_fetchMore", Qt::QueuedConnection);
+}
+
+/*!
+  \internal
+*/
+void QAbstractItemView::verticalScrollbarValueChanged(int value)
+{
+    Q_D(QAbstractItemView);
+    if (verticalScrollBar()->maximum() == value && d->model->canFetchMore(d->root))
+        d->model->fetchMore(d->root);
+}
+
+/*!
+  \internal
+*/
+void QAbstractItemView::horizontalScrollbarValueChanged(int value)
+{
+    Q_D(QAbstractItemView);
+    if (horizontalScrollBar()->maximum() == value && d->model->canFetchMore(d->root))
+        d->model->fetchMore(d->root);
+}
+
+/*!
+    \internal
+*/
+void QAbstractItemView::verticalScrollbarAction(int)
+{
+    //do nothing
+}
+
+/*!
+    \internal
+*/
+void QAbstractItemView::horizontalScrollbarAction(int)
+{
+    //do nothing
+}
+
+/*!
+    Closes the given \a editor, and releases it. The \a hint is
+    used to specify how the view should respond to the end of the editing
+    operation. For example, the hint may indicate that the next item in
+    the view should be opened for editing.
+
+    \sa edit(), commitData()
+*/
+
+void QAbstractItemView::closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint)
+{
+    Q_D(QAbstractItemView);
+
+    // Close the editor
+    if (editor) {
+        bool isPersistent = d->persistent.contains(editor);
+        bool hadFocus = editor->hasFocus();
+        QModelIndex index = d->indexForEditor(editor);
+        if (!index.isValid())
+            return; // the editor was not registered
+
+        if (!isPersistent) {
+            setState(NoState);
+            QModelIndex index = d->indexForEditor(editor);
+            editor->removeEventFilter(d->delegateForIndex(index));
+            d->removeEditor(editor);
+        }
+        if (hadFocus)
+            setFocus(); // this will send a focusLost event to the editor
+        else
+            d->checkPersistentEditorFocus();
+
+        QPointer<QWidget> ed = editor;
+        QApplication::sendPostedEvents(editor, 0);
+        editor = ed;
+
+        if (!isPersistent && editor)
+            d->releaseEditor(editor);
+    }
+
+    // The EndEditHint part
+    QItemSelectionModel::SelectionFlags flags = QItemSelectionModel::ClearAndSelect
+                                                | d->selectionBehaviorFlags();
+    switch (hint) {
+    case QAbstractItemDelegate::EditNextItem: {
+        QModelIndex index = moveCursor(MoveNext, Qt::NoModifier);
+        if (index.isValid()) {
+            QPersistentModelIndex persistent(index);
+            d->selectionModel->setCurrentIndex(persistent, flags);
+            // currentChanged signal would have already started editing
+            if (index.flags() & Qt::ItemIsEditable
+                && (!(editTriggers() & QAbstractItemView::CurrentChanged)))
+                edit(persistent);
+        } break; }
+    case QAbstractItemDelegate::EditPreviousItem: {
+        QModelIndex index = moveCursor(MovePrevious, Qt::NoModifier);
+        if (index.isValid()) {
+            QPersistentModelIndex persistent(index);
+            d->selectionModel->setCurrentIndex(persistent, flags);
+            // currentChanged signal would have already started editing
+            if (index.flags() & Qt::ItemIsEditable
+                && (!(editTriggers() & QAbstractItemView::CurrentChanged)))
+                edit(persistent);
+        } break; }
+    case QAbstractItemDelegate::SubmitModelCache:
+        d->model->submit();
+        break;
+    case QAbstractItemDelegate::RevertModelCache:
+        d->model->revert();
+        break;
+    default:
+        break;
+    }
+}
+
+/*!
+  Commit the data in the \a editor to the model.
+
+  \sa closeEditor()
+*/
+void QAbstractItemView::commitData(QWidget *editor)
+{
+    Q_D(QAbstractItemView);
+    if (!editor || !d->itemDelegate || d->currentlyCommittingEditor)
+        return;
+    QModelIndex index = d->indexForEditor(editor);
+    if (!index.isValid())
+        return;
+    d->currentlyCommittingEditor = editor;
+    QAbstractItemDelegate *delegate = d->delegateForIndex(index);
+    editor->removeEventFilter(delegate);
+    delegate->setModelData(editor, d->model, index);
+    editor->installEventFilter(delegate);
+    d->currentlyCommittingEditor = 0;
+}
+
+/*!
+  This function is called when the given \a editor has been destroyed.
+
+  \sa closeEditor()
+*/
+void QAbstractItemView::editorDestroyed(QObject *editor)
+{
+    Q_D(QAbstractItemView);
+    QWidget *w = qobject_cast<QWidget*>(editor);
+    d->removeEditor(w);
+    d->persistent.remove(w);
+    if (state() == EditingState)
+        setState(NoState);
+}
+
+/*!
+    \obsolete
+    Sets the horizontal scroll bar's steps per item to \a steps.
+
+    This is the number of steps used by the horizontal scroll bar to
+    represent the width of an item.
+
+    Note that if the view has a horizontal header, the item steps
+    will be ignored and the header section size will be used instead.
+
+    \sa horizontalStepsPerItem() setVerticalStepsPerItem()
+*/
+void QAbstractItemView::setHorizontalStepsPerItem(int steps)
+{
+    Q_UNUSED(steps);
+    // do nothing
+}
+
+/*!
+    \obsolete
+    Returns the horizontal scroll bar's steps per item.
+
+    \sa setHorizontalStepsPerItem() verticalStepsPerItem()
+*/
+int QAbstractItemView::horizontalStepsPerItem() const
+{
+    return 1;
+}
+
+/*!
+    \obsolete
+    Sets the vertical scroll bar's steps per item to \a steps.
+
+    This is the number of steps used by the vertical scroll bar to
+    represent the height of an item.
+
+    Note that if the view has a vertical header, the item steps
+    will be ignored and the header section size will be used instead.
+
+    \sa verticalStepsPerItem() setHorizontalStepsPerItem()
+*/
+void QAbstractItemView::setVerticalStepsPerItem(int steps)
+{
+    Q_UNUSED(steps);
+    // do nothing
+}
+
+/*!
+    \obsolete
+    Returns the vertical scroll bar's steps per item.
+
+    \sa setVerticalStepsPerItem() horizontalStepsPerItem()
+*/
+int QAbstractItemView::verticalStepsPerItem() const
+{
+    return 1;
+}
+
+/*!
+  Moves to and selects the item best matching the string \a search.
+  If no item is found nothing happens.
+
+  In the default implementation, the search is reset if \a search is empty, or
+  the time interval since the last search has exceeded
+  QApplication::keyboardInputInterval().
+*/
+void QAbstractItemView::keyboardSearch(const QString &search)
+{
+    Q_D(QAbstractItemView);
+    if (!d->model->rowCount(d->root) || !d->model->columnCount(d->root))
+        return;
+
+    QModelIndex start = currentIndex().isValid() ? currentIndex()
+                        : d->model->index(0, 0, d->root);
+    QTime now(QTime::currentTime());
+    bool skipRow = false;
+    if (search.isEmpty()
+        || (d->keyboardInputTime.msecsTo(now) > QApplication::keyboardInputInterval())) {
+        d->keyboardInput = search;
+        skipRow = true;
+    } else {
+        d->keyboardInput += search;
+    }
+    d->keyboardInputTime = now;
+
+    // special case for searches with same key like 'aaaaa'
+    bool sameKey = false;
+    if (d->keyboardInput.length() > 1) {
+        int c = d->keyboardInput.count(d->keyboardInput.at(d->keyboardInput.length() - 1));
+        sameKey = (c == d->keyboardInput.length());
+        if (sameKey)
+            skipRow = true;
+    }
+
+    // skip if we are searching for the same key or a new search started
+    if (skipRow) {
+        QModelIndex parent = start.parent();
+        int newRow = (start.row() < d->model->rowCount(parent) - 1) ? start.row() + 1 : 0;
+        start = d->model->index(newRow, start.column(), parent);
+    }
+
+    // search from start with wraparound
+    const QString searchString = sameKey ? QString(d->keyboardInput.at(0)) : d->keyboardInput;
+    QModelIndex current = start;
+    QModelIndexList match;
+    QModelIndex firstMatch;
+    QModelIndexList previous;
+    do {
+        match = d->model->match(current, Qt::DisplayRole, searchString);
+        if (match == previous)
+            break;
+        firstMatch = match.value(0);
+        previous = match;
+        if (firstMatch.isValid()) {
+            if (d->isIndexEnabled(firstMatch)) {
+                setCurrentIndex(firstMatch);
+                break;
+            }
+	    int row = firstMatch.row() + 1;
+	    if (row >= d->model->rowCount(firstMatch.parent()))
+	        row = 0;
+            current = firstMatch.sibling(row, firstMatch.column());
+        }
+    } while (current != start && firstMatch.isValid());
+}
+
+/*!
+    Returns the size hint for the item with the specified \a index or
+    an invalid size for invalid indexes.
+
+    \sa sizeHintForRow(), sizeHintForColumn()
+*/
+QSize QAbstractItemView::sizeHintForIndex(const QModelIndex &index) const
+{
+    Q_D(const QAbstractItemView);
+    if (!d->isIndexValid(index) || !d->itemDelegate)
+        return QSize();
+    return d->delegateForIndex(index)->sizeHint(d->viewOptionsV4(), index);
+}
+
+/*!
+    Returns the height size hint for the specified \a row or -1 if
+    there is no model.
+
+    The returned height is calculated using the size hints of the
+    given \a row's items, i.e. the returned value is the maximum
+    height among the items. Note that to control the height of a row,
+    you must reimplement the QAbstractItemDelegate::sizeHint()
+    function.
+
+    This function is used in views with a vertical header to find the
+    size hint for a header section based on the contents of the given
+    \a row.
+
+    \sa sizeHintForColumn()
+*/
+int QAbstractItemView::sizeHintForRow(int row) const
+{
+    Q_D(const QAbstractItemView);
+
+    if (row < 0 || row >= d->model->rowCount() || !model())
+        return -1;
+
+    QStyleOptionViewItemV4 option = d->viewOptionsV4();
+    int height = 0;
+    int colCount = d->model->columnCount(d->root);
+    QModelIndex index;
+    for (int c = 0; c < colCount; ++c) {
+        index = d->model->index(row, c, d->root);
+        if (QWidget *editor = d->editorForIndex(index).editor)
+            height = qMax(height, editor->size().height());
+        int hint = d->delegateForIndex(index)->sizeHint(option, index).height();
+        height = qMax(height, hint);
+    }
+    return height;
+}
+
+/*!
+    Returns the width size hint for the specified \a column or -1 if there is no model.
+
+    This function is used in views with a horizontal header to find the size hint for
+    a header section based on the contents of the given \a column.
+
+    \sa sizeHintForRow()
+*/
+int QAbstractItemView::sizeHintForColumn(int column) const
+{
+    Q_D(const QAbstractItemView);
+
+    if (column < 0 || column >= d->model->columnCount() || !model())
+        return -1;
+
+    QStyleOptionViewItemV4 option = d->viewOptionsV4();
+    int width = 0;
+    int rows = d->model->rowCount(d->root);
+    QModelIndex index;
+    for (int r = 0; r < rows; ++r) {
+        index = d->model->index(r, column, d->root);
+        if (QWidget *editor = d->editorForIndex(index).editor)
+            width = qMax(width, editor->sizeHint().width());
+        int hint = d->delegateForIndex(index)->sizeHint(option, index).width();
+        width = qMax(width, hint);
+    }
+    return width;
+}
+
+/*!
+    Opens a persistent editor on the item at the given \a index.
+    If no editor exists, the delegate will create a new editor.
+
+    \sa closePersistentEditor()
+*/
+void QAbstractItemView::openPersistentEditor(const QModelIndex &index)
+{
+    Q_D(QAbstractItemView);
+    QStyleOptionViewItemV4 options = d->viewOptionsV4();
+    options.rect = visualRect(index);
+    options.state |= (index == currentIndex() ? QStyle::State_HasFocus : QStyle::State_None);
+
+    QWidget *editor = d->editor(index, options);
+    if (editor) {
+        editor->show();
+        d->persistent.insert(editor);
+    }
+}
+
+/*!
+  Closes the persistent editor for the item at the given \a index.
+
+  \sa openPersistentEditor()
+*/
+void QAbstractItemView::closePersistentEditor(const QModelIndex &index)
+{
+    Q_D(QAbstractItemView);
+    QWidget *editor = d->editorForIndex(index).editor;
+    if (editor) {
+        if (index == selectionModel()->currentIndex())
+            closeEditor(editor, QAbstractItemDelegate::RevertModelCache);
+        d->persistent.remove(editor);
+        d->removeEditor(editor);
+        d->releaseEditor(editor);
+    }
+}
+
+/*!
+    \since 4.1
+
+    Sets the given \a widget on the item at the given \a index, passing the
+    ownership of the widget to the viewport.
+
+    If \a index is invalid (e.g., if you pass the root index), this function
+    will do nothing.
+
+    The given \a widget's \l{QWidget}{autoFillBackground} property must be set
+    to true, otherwise the widget's background will be transparent, showing
+    both the model data and the item at the given \a index.
+
+    If index widget A is replaced with index widget B, index widget A will be
+    deleted. For example, in the code snippet below, the QLineEdit object will
+    be deleted.
+
+    \snippet doc/src/snippets/code/src_gui_itemviews_qabstractitemview.cpp 1
+
+    This function should only be used to display static content within the
+    visible area corresponding to an item of data. If you want to display
+    custom dynamic content or implement a custom editor widget, subclass
+    QItemDelegate instead.
+
+    \sa {Delegate Classes}
+*/
+void QAbstractItemView::setIndexWidget(const QModelIndex &index, QWidget *widget)
+{
+    Q_D(QAbstractItemView);
+    if (!d->isIndexValid(index))
+        return;
+    if (QWidget *oldWidget = indexWidget(index)) {
+        d->removeEditor(oldWidget);
+        oldWidget->deleteLater();
+    }
+    if (widget) {
+        widget->setParent(viewport());
+        d->persistent.insert(widget);
+        d->addEditor(index, widget, true);
+        widget->show();
+        if (!d->delayedPendingLayout)
+            widget->setGeometry(visualRect(index));
+        dataChanged(index, index); // update the geometry
+    }
+}
+
+/*!
+    \since 4.1
+
+    Returns the widget for the item at the given \a index.
+*/
+QWidget* QAbstractItemView::indexWidget(const QModelIndex &index) const
+{
+    Q_D(const QAbstractItemView);
+    if (!d->isIndexValid(index))
+        return 0;
+    return d->editorForIndex(index).editor;
+}
+
+/*!
+    \since 4.1
+
+    Scrolls the view to the top.
+
+    \sa scrollTo(), scrollToBottom()
+*/
+void QAbstractItemView::scrollToTop()
+{
+    verticalScrollBar()->setValue(verticalScrollBar()->minimum());
+}
+
+/*!
+    \since 4.1
+
+    Scrolls the view to the bottom.
+
+    \sa scrollTo(), scrollToTop()
+*/
+void QAbstractItemView::scrollToBottom()
+{
+    Q_D(QAbstractItemView);
+    if (d->delayedPendingLayout) {
+        d->executePostedLayout();
+        updateGeometries();
+    }
+    verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+}
+
+/*!
+    \since 4.3
+
+    Updates the area occupied by the given \a index.
+
+*/
+void QAbstractItemView::update(const QModelIndex &index)
+{
+    Q_D(QAbstractItemView);
+    if (index.isValid())
+        d->viewport->update(visualRect(index));
+}
+
+/*!
+    This slot is called when items are changed in the model. The
+    changed items are those from \a topLeft to \a bottomRight
+    inclusive. If just one item is changed \a topLeft == \a
+    bottomRight.
+*/
+void QAbstractItemView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
+{
+    // Single item changed
+    Q_D(QAbstractItemView);
+    if (topLeft == bottomRight && topLeft.isValid()) {
+        const QEditorInfo editorInfo = d->editorForIndex(topLeft);
+        //we don't update the edit data if it is static
+        if (!editorInfo.isStatic && editorInfo.editor) {
+            QAbstractItemDelegate *delegate = d->delegateForIndex(topLeft);
+            if (delegate) {
+                delegate->setEditorData(editorInfo.editor, topLeft);
+            }
+        }
+        if (isVisible() && !d->delayedPendingLayout) {
+            // otherwise the items will be update later anyway
+            d->viewport->update(visualRect(topLeft));
+        }
+        return;
+    }
+    d->updateEditorData(topLeft, bottomRight);
+    if (!isVisible() || d->delayedPendingLayout)
+        return; // no need to update
+    d->viewport->update();
+}
+
+/*!
+    This slot is called when rows are inserted. The new rows are those
+    under the given \a parent from \a start to \a end inclusive. The
+    base class implementation calls fetchMore() on the model to check
+    for more data.
+
+    \sa rowsAboutToBeRemoved()
+*/
+void QAbstractItemView::rowsInserted(const QModelIndex &, int, int)
+{
+    if (!isVisible())
+        QMetaObject::invokeMethod(this, "_q_fetchMore", Qt::QueuedConnection);
+    else
+        updateEditorGeometries();
+}
+
+/*!
+    This slot is called when rows are about to be removed. The deleted rows are
+    those under the given \a parent from \a start to \a end inclusive.
+
+    \sa rowsInserted()
+*/
+void QAbstractItemView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
+{
+    Q_D(QAbstractItemView);
+
+    setState(CollapsingState);
+
+    // Ensure one selected item in single selection mode.
+    QModelIndex current = currentIndex();
+    if (d->selectionMode == SingleSelection
+        && current.isValid()
+        && current.row() >= start
+        && current.row() <= end
+        && current.parent() == parent) {
+        int totalToRemove = end - start + 1;
+        if (d->model->rowCount(parent) <= totalToRemove) { // no more children
+            QModelIndex index = parent;
+            while (index != d->root && !d->isIndexEnabled(index))
+                index = index.parent();
+            if (index != d->root)
+                setCurrentIndex(index);
+        } else {
+            int row = end + 1;
+            QModelIndex next;
+            do { // find the next visible and enabled item
+                next = d->model->index(row++, current.column(), current.parent());
+            } while (next.isValid() && (isIndexHidden(next) || !d->isIndexEnabled(next)));
+            if (row > d->model->rowCount(parent)) {
+                row = start - 1;
+                do { // find the previous visible and enabled item
+                    next = d->model->index(row--, current.column(), current.parent());
+                } while (next.isValid() && (isIndexHidden(next) || !d->isIndexEnabled(next)));
+            }
+            setCurrentIndex(next);
+        }
+    }
+
+    // Remove all affected editors; this is more efficient than waiting for updateGeometries() to clean out editors for invalid indexes
+    for (int i = d->editors.size() - 1; i >= 0; --i) {
+        const QModelIndex index = d->editors.at(i).index;
+        QWidget *editor = d->editors.at(i).editor;
+        if (index.row() >= start && index.row() <= end && d->model->parent(index) == parent) {
+            d->editors.removeAt(i);
+            d->releaseEditor(editor);
+        }
+    }
+}
+
+/*!
+    \internal
+
+    This slot is called when rows have been removed. The deleted
+    rows are those under the given \a parent from \a start to \a end
+    inclusive.
+*/
+void QAbstractItemViewPrivate::_q_rowsRemoved(const QModelIndex &, int, int)
+{
+    Q_Q(QAbstractItemView);
+    if (q->isVisible())
+        q->updateEditorGeometries();
+    q->setState(QAbstractItemView::NoState);
+}
+
+/*!
+    \internal
+
+    This slot is called when columns are about to be removed. The deleted
+    columns are those under the given \a parent from \a start to \a end
+    inclusive.
+*/
+void QAbstractItemViewPrivate::_q_columnsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
+{
+    Q_Q(QAbstractItemView);
+
+    q->setState(QAbstractItemView::CollapsingState);
+
+    // Ensure one selected item in single selection mode.
+    QModelIndex current = q->currentIndex();
+    if (current.isValid()
+        && selectionMode == QAbstractItemView::SingleSelection
+        && current.column() >= start
+        && current.column() <= end) {
+        int totalToRemove = end - start + 1;
+        if (model->columnCount(parent) < totalToRemove) { // no more columns
+            QModelIndex index = parent;
+            while (index.isValid() && !isIndexEnabled(index))
+                index = index.parent();
+            if (index.isValid())
+                q->setCurrentIndex(index);
+        } else {
+            int column = end;
+            QModelIndex next;
+            do { // find the next visible and enabled item
+                next = model->index(current.row(), column++, current.parent());
+            } while (next.isValid() && (q->isIndexHidden(next) || !isIndexEnabled(next)));
+            q->setCurrentIndex(next);
+        }
+    }
+
+    // Remove all affected editors; this is more efficient than waiting for updateGeometries() to clean out editors for invalid indexes
+    QList<QEditorInfo>::iterator it = editors.begin();
+    while (it != editors.end()) {
+        QModelIndex index = it->index;
+        if (index.column() <= start && index.column() >= end && model->parent(index) == parent) {
+            QWidget *editor = it->editor;
+            it = editors.erase(it);
+            releaseEditor(editor);
+        } else {
+            ++it;
+        }
+    }
+}
+
+/*!
+    \internal
+
+    This slot is called when columns have been removed. The deleted
+    rows are those under the given \a parent from \a start to \a end
+    inclusive.
+*/
+void QAbstractItemViewPrivate::_q_columnsRemoved(const QModelIndex &, int, int)
+{
+    Q_Q(QAbstractItemView);
+    if (q->isVisible())
+        q->updateEditorGeometries();
+    q->setState(QAbstractItemView::NoState);
+}
+
+/*!
+    \internal
+
+    This slot is called when rows have been inserted.
+*/
+void QAbstractItemViewPrivate::_q_columnsInserted(const QModelIndex &, int, int)
+{
+    Q_Q(QAbstractItemView);
+    if (q->isVisible())
+        q->updateEditorGeometries();
+}
+
+
+
+/*!
+    \internal
+*/
+void QAbstractItemViewPrivate::_q_modelDestroyed()
+{
+    Q_Q(QAbstractItemView);
+    model = QAbstractItemModelPrivate::staticEmptyModel();
+    QMetaObject::invokeMethod(q, "reset", Qt::QueuedConnection);
+}
+
+/*!
+    \internal
+
+    This slot is called when the layout is changed.
+*/
+void QAbstractItemViewPrivate::_q_layoutChanged()
+{
+    doDelayedItemsLayout();
+}
+
+/*!
+    This slot is called when the selection is changed. The previous
+    selection (which may be empty), is specified by \a deselected, and the
+    new selection by \a selected.
+
+    \sa setSelection()
+*/
+void QAbstractItemView::selectionChanged(const QItemSelection &selected,
+                                         const QItemSelection &deselected)
+{
+    Q_D(QAbstractItemView);
+    if (isVisible() && updatesEnabled()) {
+        d->setDirtyRegion(visualRegionForSelection(deselected));
+        d->setDirtyRegion(visualRegionForSelection(selected));
+        d->updateDirtyRegion();
+    }
+}
+
+/*!
+    This slot is called when a new item becomes the current item.
+    The previous current item is specified by the \a previous index, and the new
+    item by the \a current index.
+
+    If you want to know about changes to items see the
+    dataChanged() signal.
+*/
+void QAbstractItemView::currentChanged(const QModelIndex &current, const QModelIndex &previous)
+{
+    Q_D(QAbstractItemView);
+    Q_ASSERT(d->model);
+
+    if (previous.isValid()) {
+        QModelIndex buddy = d->model->buddy(previous);
+        QWidget *editor = d->editorForIndex(buddy).editor;
+        if (editor && !d->persistent.contains(editor)) {
+            commitData(editor);
+            if (current.row() != previous.row())
+                closeEditor(editor, QAbstractItemDelegate::SubmitModelCache);
+            else
+                closeEditor(editor, QAbstractItemDelegate::NoHint);
+        }
+        if (isVisible()) {
+            d->setDirtyRegion(visualRect(previous));
+            d->updateDirtyRegion();
+        }
+    }
+    if (isVisible() && current.isValid() && !d->autoScrollTimer.isActive()) {
+        if (d->autoScroll)
+            scrollTo(current);
+        d->setDirtyRegion(visualRect(current));
+        d->updateDirtyRegion();
+        edit(current, CurrentChanged, 0);
+        if (current.row() == (d->model->rowCount(d->root) - 1))
+            d->_q_fetchMore();
+    }
+}
+
+#ifndef QT_NO_DRAGANDDROP
+/*!
+    Starts a drag by calling drag->exec() using the given \a supportedActions.
+*/
+void QAbstractItemView::startDrag(Qt::DropActions supportedActions)
+{
+    Q_D(QAbstractItemView);
+    QModelIndexList indexes = d->selectedDraggableIndexes();
+    if (indexes.count() > 0) {
+        QMimeData *data = d->model->mimeData(indexes);
+        if (!data)
+            return;
+        QRect rect;
+        QPixmap pixmap = d->renderToPixmap(indexes, &rect);
+        rect.adjust(horizontalOffset(), verticalOffset(), 0, 0);
+        QDrag *drag = new QDrag(this);
+        drag->setPixmap(pixmap);
+        drag->setMimeData(data);
+        drag->setHotSpot(d->pressedPosition - rect.topLeft());
+        Qt::DropAction defaultDropAction = Qt::IgnoreAction;
+        if (supportedActions & Qt::CopyAction && dragDropMode() != QAbstractItemView::InternalMove)
+            defaultDropAction = Qt::CopyAction;
+        if (drag->exec(supportedActions, defaultDropAction) == Qt::MoveAction)
+            d->clearOrRemove();
+    }
+}
+#endif // QT_NO_DRAGANDDROP
+
+/*!
+    Returns a QStyleOptionViewItem structure populated with the view's
+    palette, font, state, alignments etc.
+*/
+QStyleOptionViewItem QAbstractItemView::viewOptions() const
+{
+    Q_D(const QAbstractItemView);
+    QStyleOptionViewItem option;
+    option.init(this);
+    option.state &= ~QStyle::State_MouseOver;
+    option.font = font();
+
+#ifdef Q_WS_WIN
+    // Note this is currently required on Windows
+    // do give non-focused item views inactive appearance
+    if (!hasFocus())
+        option.state &= ~QStyle::State_Active;
+#endif
+
+    option.state &= ~QStyle::State_HasFocus;
+    if (d->iconSize.isValid()) {
+        option.decorationSize = d->iconSize;
+    } else {
+        int pm = style()->pixelMetric(QStyle::PM_SmallIconSize, 0, this);
+        option.decorationSize = QSize(pm, pm);
+    }
+    option.decorationPosition = QStyleOptionViewItem::Left;
+    option.decorationAlignment = Qt::AlignCenter;
+    option.displayAlignment = Qt::AlignLeft|Qt::AlignVCenter;
+    option.textElideMode = d->textElideMode;
+    option.rect = QRect();
+    option.showDecorationSelected = style()->styleHint(QStyle::SH_ItemView_ShowDecorationSelected, 0, this);
+    return option;
+}
+
+QStyleOptionViewItemV4 QAbstractItemViewPrivate::viewOptionsV4() const
+{
+    Q_Q(const QAbstractItemView);
+    QStyleOptionViewItemV4 option = q->viewOptions();
+    if (wrapItemText)
+        option.features = QStyleOptionViewItemV2::WrapText;
+    option.locale = q->locale();
+    option.locale.setNumberOptions(QLocale::OmitGroupSeparator);
+    option.widget = q;
+    return option;
+}
+
+/*!
+    Returns the item view's state.
+
+    \sa setState()
+*/
+QAbstractItemView::State QAbstractItemView::state() const
+{
+    Q_D(const QAbstractItemView);
+    return d->state;
+}
+
+/*!
+    Sets the item view's state to the given \a state.
+
+    \sa state()
+*/
+void QAbstractItemView::setState(State state)
+{
+    Q_D(QAbstractItemView);
+    d->state = state;
+}
+
+/*!
+  Schedules a layout of the items in the view to be executed when the
+  event processing starts.
+
+  Even if scheduleDelayedItemsLayout() is called multiple times before
+  events are processed, the view will only do the layout once.
+
+  \sa executeDelayedItemsLayout()
+*/
+void QAbstractItemView::scheduleDelayedItemsLayout()
+{
+    Q_D(QAbstractItemView);
+    d->doDelayedItemsLayout();
+}
+
+/*!
+  Executes the scheduled layouts without waiting for the event processing
+  to begin.
+
+  \sa scheduleDelayedItemsLayout()
+*/
+void QAbstractItemView::executeDelayedItemsLayout()
+{
+    Q_D(QAbstractItemView);
+    d->executePostedLayout();
+}
+
+/*!
+    \since 4.1
+
+    Marks the given \a region as dirty and schedules it to be updated.
+    You only need to call this function if you are implementing
+    your own view subclass.
+
+    \sa scrollDirtyRegion(), dirtyRegionOffset()
+*/
+
+void QAbstractItemView::setDirtyRegion(const QRegion &region)
+{
+    Q_D(QAbstractItemView);
+    d->setDirtyRegion(region);
+}
+
+/*!
+  Prepares the view for scrolling by (\a{dx},\a{dy}) pixels by moving the dirty regions in the
+  opposite direction. You only need to call this function if you are implementing a scrolling
+  viewport in your view subclass.
+
+  If you implement scrollContentsBy() in a subclass of QAbstractItemView, call this function
+  before you call QWidget::scroll() on the viewport. Alternatively, just call update().
+
+  \sa scrollContentsBy(), dirtyRegionOffset(), setDirtyRegion()
+*/
+void QAbstractItemView::scrollDirtyRegion(int dx, int dy)
+{
+    Q_D(QAbstractItemView);
+    d->scrollDirtyRegion(dx, dy);
+}
+
+/*!
+  Returns the offset of the dirty regions in the view.
+
+  If you use scrollDirtyRegion() and implement a paintEvent() in a subclass of
+  QAbstractItemView, you should translate the area given by the paint event with
+  the offset returned from this function.
+
+  \sa scrollDirtyRegion(), setDirtyRegion()
+*/
+QPoint QAbstractItemView::dirtyRegionOffset() const
+{
+    Q_D(const QAbstractItemView);
+    return d->scrollDelayOffset;
+}
+
+/*!
+  \internal
+*/
+void QAbstractItemView::startAutoScroll()
+{
+    Q_D(QAbstractItemView);
+    // ### it would be nice to make this into a style hint one day
+    int scrollInterval = (verticalScrollMode() == QAbstractItemView::ScrollPerItem) ? 150 : 50;
+    d->autoScrollTimer.start(scrollInterval, this);
+    d->autoScrollCount = 0;
+}
+
+/*!
+  \internal
+*/
+void QAbstractItemView::stopAutoScroll()
+{
+    Q_D(QAbstractItemView);
+    d->autoScrollTimer.stop();
+    d->autoScrollCount = 0;
+}
+
+/*!
+  \internal
+*/
+void QAbstractItemView::doAutoScroll()
+{
+    // find how much we should scroll with
+    Q_D(QAbstractItemView);
+    int verticalStep = verticalScrollBar()->pageStep();
+    int horizontalStep = horizontalScrollBar()->pageStep();
+    if (d->autoScrollCount < qMax(verticalStep, horizontalStep))
+        ++d->autoScrollCount;
+
+    int margin = d->autoScrollMargin;
+    int verticalValue = verticalScrollBar()->value();
+    int horizontalValue = horizontalScrollBar()->value();
+
+    QPoint pos = d->viewport->mapFromGlobal(QCursor::pos());
+    QRect area = static_cast<QAbstractItemView*>(d->viewport)->d_func()->clipRect(); // access QWidget private by bending C++ rules
+
+    // do the scrolling if we are in the scroll margins
+    if (pos.y() - area.top() < margin)
+        verticalScrollBar()->setValue(verticalValue - d->autoScrollCount);
+    else if (area.bottom() - pos.y() < margin)
+        verticalScrollBar()->setValue(verticalValue + d->autoScrollCount);
+    if (pos.x() - area.left() < margin)
+        horizontalScrollBar()->setValue(horizontalValue - d->autoScrollCount);
+    else if (area.right() - pos.x() < margin)
+        horizontalScrollBar()->setValue(horizontalValue + d->autoScrollCount);
+    // if nothing changed, stop scrolling
+    bool verticalUnchanged = (verticalValue == verticalScrollBar()->value());
+    bool horizontalUnchanged = (horizontalValue == horizontalScrollBar()->value());
+    if (verticalUnchanged && horizontalUnchanged) {
+        stopAutoScroll();
+    } else {
+#ifndef QT_NO_DRAGANDDROP
+        d->dropIndicatorRect = QRect();
+        d->dropIndicatorPosition = QAbstractItemView::OnViewport;
+#endif
+        d->viewport->update();
+    }
+}
+
+/*!
+    Returns the SelectionFlags to be used when updating a selection with
+    to include the \a index specified. The \a event is a user input event,
+    such as a mouse or keyboard event.
+
+    Reimplement this function to define your own selection behavior.
+
+    \sa setSelection()
+*/
+QItemSelectionModel::SelectionFlags QAbstractItemView::selectionCommand(const QModelIndex &index,
+                                                                        const QEvent *event) const
+{
+    Q_D(const QAbstractItemView);
+    switch (d->selectionMode) {
+        case NoSelection: // Never update selection model
+            return QItemSelectionModel::NoUpdate;
+        case SingleSelection: // ClearAndSelect on valid index otherwise NoUpdate
+            if (event && event->type() == QEvent::MouseButtonRelease)
+                return QItemSelectionModel::NoUpdate;
+            return QItemSelectionModel::ClearAndSelect|d->selectionBehaviorFlags();
+        case MultiSelection:
+            return d->multiSelectionCommand(index, event);
+        case ExtendedSelection:
+            return d->extendedSelectionCommand(index, event);
+        case ContiguousSelection:
+            return d->contiguousSelectionCommand(index, event);
+    }
+    return QItemSelectionModel::NoUpdate;
+}
+
+QItemSelectionModel::SelectionFlags QAbstractItemViewPrivate::multiSelectionCommand(
+    const QModelIndex &index, const QEvent *event) const
+{
+    Q_UNUSED(index);
+
+    if (event) {
+        switch (event->type()) {
+        case QEvent::KeyPress:
+            if (static_cast<const QKeyEvent*>(event)->key() == Qt::Key_Space
+             || static_cast<const QKeyEvent*>(event)->key() == Qt::Key_Select)
+                return QItemSelectionModel::Toggle|selectionBehaviorFlags();
+            break;
+        case QEvent::MouseButtonPress:
+            if (static_cast<const QMouseEvent*>(event)->button() == Qt::LeftButton)
+                return QItemSelectionModel::Toggle|selectionBehaviorFlags(); // toggle
+            break;
+        case QEvent::MouseButtonRelease:
+            if (static_cast<const QMouseEvent*>(event)->button() == Qt::LeftButton)
+                return QItemSelectionModel::NoUpdate|selectionBehaviorFlags(); // finalize
+            break;
+        case QEvent::MouseMove:
+            if (static_cast<const QMouseEvent*>(event)->buttons() & Qt::LeftButton)
+                return QItemSelectionModel::ToggleCurrent|selectionBehaviorFlags(); // toggle drag select
+        default:
+            break;
+        }
+        return QItemSelectionModel::NoUpdate;
+    }
+
+    return QItemSelectionModel::Toggle|selectionBehaviorFlags();
+}
+
+QItemSelectionModel::SelectionFlags QAbstractItemViewPrivate::extendedSelectionCommand(
+    const QModelIndex &index, const QEvent *event) const
+{
+    Qt::KeyboardModifiers modifiers = QApplication::keyboardModifiers();
+    if (event) {
+        switch (event->type()) {
+        case QEvent::MouseMove: {
+            // Toggle on MouseMove
+            modifiers = static_cast<const QMouseEvent*>(event)->modifiers();
+            if (modifiers & Qt::ControlModifier)
+                return QItemSelectionModel::ToggleCurrent|selectionBehaviorFlags();
+            break;
+        }
+        case QEvent::MouseButtonPress: {
+            modifiers = static_cast<const QMouseEvent*>(event)->modifiers();
+            const Qt::MouseButton button = static_cast<const QMouseEvent*>(event)->button();
+            const bool rightButtonPressed = button & Qt::RightButton;
+            const bool shiftKeyPressed = modifiers & Qt::ShiftModifier;
+            const bool controlKeyPressed = modifiers & Qt::ControlModifier;
+            const bool indexIsSelected = selectionModel->isSelected(index);
+            if ((shiftKeyPressed || controlKeyPressed) && rightButtonPressed)
+                return QItemSelectionModel::NoUpdate;
+            if (!shiftKeyPressed && !controlKeyPressed && indexIsSelected)
+                return QItemSelectionModel::NoUpdate;
+            if (!index.isValid() && !rightButtonPressed && !shiftKeyPressed && !controlKeyPressed)
+                return QItemSelectionModel::Clear;
+            if (!index.isValid())
+                return QItemSelectionModel::NoUpdate;
+            break;
+        }
+        case QEvent::MouseButtonRelease: {
+            // ClearAndSelect on MouseButtonRelease if MouseButtonPress on selected item or empty area
+            modifiers = static_cast<const QMouseEvent*>(event)->modifiers();
+            const Qt::MouseButton button = static_cast<const QMouseEvent*>(event)->button();
+            const bool rightButtonPressed = button & Qt::RightButton;
+            const bool shiftKeyPressed = modifiers & Qt::ShiftModifier;
+            const bool controlKeyPressed = modifiers & Qt::ControlModifier;
+            if (((index == pressedIndex && selectionModel->isSelected(index))
+		 || !index.isValid()) && state != QAbstractItemView::DragSelectingState
+                && !shiftKeyPressed && !controlKeyPressed && !rightButtonPressed)
+                return QItemSelectionModel::ClearAndSelect|selectionBehaviorFlags();
+            return QItemSelectionModel::NoUpdate;
+        }
+        case QEvent::KeyPress: {
+            // NoUpdate on Key movement and Ctrl
+            modifiers = static_cast<const QKeyEvent*>(event)->modifiers();
+            switch (static_cast<const QKeyEvent*>(event)->key()) {
+            case Qt::Key_Backtab:
+                modifiers = modifiers & ~Qt::ShiftModifier; // special case for backtab
+            case Qt::Key_Down:
+            case Qt::Key_Up:
+            case Qt::Key_Left:
+            case Qt::Key_Right:
+            case Qt::Key_Home:
+            case Qt::Key_End:
+            case Qt::Key_PageUp:
+            case Qt::Key_PageDown:
+            case Qt::Key_Tab:
+#ifdef QT_KEYPAD_NAVIGATION
+                return QItemSelectionModel::NoUpdate;
+#else
+                if (modifiers & Qt::ControlModifier)
+                    return QItemSelectionModel::NoUpdate;
+#endif
+                break;
+            case Qt::Key_Select:
+                return QItemSelectionModel::Toggle|selectionBehaviorFlags();
+            case Qt::Key_Space:// Toggle on Ctrl-Qt::Key_Space, Select on Space
+                if (modifiers & Qt::ControlModifier)
+                    return QItemSelectionModel::Toggle|selectionBehaviorFlags();
+                return QItemSelectionModel::Select|selectionBehaviorFlags();
+            default:
+                break;
+            }
+        }
+        default:
+            break;
+        }
+    }
+
+    if (modifiers & Qt::ShiftModifier)
+        return QItemSelectionModel::SelectCurrent|selectionBehaviorFlags();
+    if (modifiers & Qt::ControlModifier)
+        return QItemSelectionModel::Toggle|selectionBehaviorFlags();
+    if (state == QAbstractItemView::DragSelectingState) {
+        //when drag-selecting we need to clear any previous selection and select the current one
+        return QItemSelectionModel::Clear|QItemSelectionModel::SelectCurrent|selectionBehaviorFlags();
+    }
+
+    return QItemSelectionModel::ClearAndSelect|selectionBehaviorFlags();
+}
+
+QItemSelectionModel::SelectionFlags
+QAbstractItemViewPrivate::contiguousSelectionCommand(const QModelIndex &index,
+                                                     const QEvent *event) const
+{
+    QItemSelectionModel::SelectionFlags flags = extendedSelectionCommand(index, event);
+    const int Mask = QItemSelectionModel::Clear | QItemSelectionModel::Select
+                     | QItemSelectionModel::Deselect | QItemSelectionModel::Toggle
+                     | QItemSelectionModel::Current;
+
+    switch (flags & Mask) {
+    case QItemSelectionModel::Clear:
+    case QItemSelectionModel::ClearAndSelect:
+    case QItemSelectionModel::SelectCurrent:
+        return flags;
+    case QItemSelectionModel::NoUpdate:
+        if (event &&
+            (event->type() == QEvent::MouseButtonPress
+             || event->type() == QEvent::MouseButtonRelease))
+            return flags;
+        return QItemSelectionModel::ClearAndSelect|selectionBehaviorFlags();
+    default:
+        return QItemSelectionModel::SelectCurrent|selectionBehaviorFlags();
+    }
+}
+
+void QAbstractItemViewPrivate::_q_fetchMore()
+{
+    if (!model->canFetchMore(root))
+        return;
+    int last = model->rowCount(root) - 1;
+    if (last < 0) {
+        model->fetchMore(root);
+        return;
+    }
+
+    QModelIndex index = model->index(last, 0, root);
+    QRect rect = q_func()->visualRect(index);
+    if (viewport->rect().intersects(rect))
+        model->fetchMore(root);
+}
+
+bool QAbstractItemViewPrivate::shouldEdit(QAbstractItemView::EditTrigger trigger,
+                                          const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return false;
+    Qt::ItemFlags flags = model->flags(index);
+    if (((flags & Qt::ItemIsEditable) == 0) || ((flags & Qt::ItemIsEnabled) == 0))
+        return false;
+    if (state == QAbstractItemView::EditingState)
+        return false;
+    if (hasEditor(index))
+        return false;
+    if (trigger == QAbstractItemView::AllEditTriggers) // force editing
+        return true;
+    if ((trigger & editTriggers) == QAbstractItemView::SelectedClicked
+        && !selectionModel->isSelected(index))
+        return false;
+    return (trigger & editTriggers);
+}
+
+bool QAbstractItemViewPrivate::shouldForwardEvent(QAbstractItemView::EditTrigger trigger,
+                                                  const QEvent *event) const
+{
+    if (!event || (trigger & editTriggers) != QAbstractItemView::AnyKeyPressed)
+        return false;
+
+    switch (event->type()) {
+        case QEvent::KeyPress:
+        case QEvent::MouseButtonDblClick:
+        case QEvent::MouseButtonPress:
+        case QEvent::MouseButtonRelease:
+        case QEvent::MouseMove:
+            return true;
+        default:
+            break;
+    };
+
+    return false;
+}
+
+bool QAbstractItemViewPrivate::shouldAutoScroll(const QPoint &pos) const
+{
+    if (!autoScroll)
+        return false;
+    QRect area = static_cast<QAbstractItemView*>(viewport)->d_func()->clipRect(); // access QWidget private by bending C++ rules
+    return (pos.y() - area.top() < autoScrollMargin)
+        || (area.bottom() - pos.y() < autoScrollMargin)
+        || (pos.x() - area.left() < autoScrollMargin)
+        || (area.right() - pos.x() < autoScrollMargin);
+}
+
+void QAbstractItemViewPrivate::doDelayedItemsLayout(int delay)
+{
+    if (!delayedPendingLayout) {
+        delayedPendingLayout = true;
+        delayedLayout.start(delay, q_func());
+    }
+}
+
+void QAbstractItemViewPrivate::interruptDelayedItemsLayout() const
+{
+    delayedLayout.stop();
+    delayedPendingLayout = false;
+}
+
+
+
+QWidget *QAbstractItemViewPrivate::editor(const QModelIndex &index,
+                                          const QStyleOptionViewItem &options)
+{
+    Q_Q(QAbstractItemView);
+    QWidget *w = editorForIndex(index).editor;
+    if (!w) {
+        QAbstractItemDelegate *delegate = delegateForIndex(index);
+        if (!delegate)
+            return 0;
+        w = delegate->createEditor(viewport, options, index);
+        if (w) {
+            w->installEventFilter(delegate);
+            QObject::connect(w, SIGNAL(destroyed(QObject*)), q, SLOT(editorDestroyed(QObject*)));
+            delegate->updateEditorGeometry(w, options, index);
+            delegate->setEditorData(w, index);
+            addEditor(index, w, false);
+            if (w->parent() == viewport)
+                QWidget::setTabOrder(q, w);
+
+            // Special cases for some editors containing QLineEdit
+            QWidget *focusWidget = w;
+            while (QWidget *fp = focusWidget->focusProxy())
+                focusWidget = fp;
+#ifndef QT_NO_LINEEDIT
+            if (QLineEdit *le = qobject_cast<QLineEdit*>(focusWidget))
+                le->selectAll();
+#endif
+#ifndef QT_NO_SPINBOX
+            if (QSpinBox *sb = qobject_cast<QSpinBox*>(focusWidget))
+                sb->selectAll();
+            else if (QDoubleSpinBox *dsb = qobject_cast<QDoubleSpinBox*>(focusWidget))
+                dsb->selectAll();
+#endif
+        }
+    }
+    return w;
+}
+
+void QAbstractItemViewPrivate::updateEditorData(const QModelIndex &tl, const QModelIndex &br)
+{
+    // we are counting on having relatively few editors
+    const bool checkIndexes = tl.isValid() && br.isValid();
+    const QModelIndex parent = tl.parent();
+    QList<QEditorInfo>::const_iterator it = editors.constBegin();
+    for (; it != editors.constEnd(); ++it) {
+        QWidget *editor = it->editor;
+        const QModelIndex index = it->index;
+        if (it->isStatic || editor == 0 || !index.isValid() ||
+            (checkIndexes
+                && (index.row() < tl.row() || index.row() > br.row()
+                    || index.column() < tl.column() || index.column() > br.column()
+                    || index.parent() != parent)))
+            continue;
+
+        QAbstractItemDelegate *delegate = delegateForIndex(index);
+        if (delegate) {
+            delegate->setEditorData(editor, index);
+        }
+    }
+}
+
+/*!
+    \internal
+
+    In DND if something has been moved then this is called.
+    Typically this means you should "remove" the selected item or row,
+    but the behavior is view dependant (table just clears the selected indexes for example).
+
+    Either remove the selected rows or clear them
+  */
+void QAbstractItemViewPrivate::clearOrRemove()
+{
+#ifndef QT_NO_DRAGANDDROP
+    const QItemSelection selection = selectionModel->selection();
+    QList<QItemSelectionRange>::const_iterator it = selection.constBegin();
+
+    if (!overwrite) {
+        for (; it != selection.constEnd(); ++it) {
+            QModelIndex parent = (*it).parent();
+            if ((*it).left() != 0)
+                continue;
+            if ((*it).right() != (model->columnCount(parent) - 1))
+                continue;
+            int count = (*it).bottom() - (*it).top() + 1;
+            model->removeRows((*it).top(), count, parent);
+        }
+    } else {
+        // we can't remove the rows so reset the items (i.e. the view is like a table)
+        QModelIndexList list = selection.indexes();
+        for (int i=0; i < list.size(); ++i) {
+            QModelIndex index = list.at(i);
+            QMap<int, QVariant> roles = model->itemData(index);
+            for (QMap<int, QVariant>::Iterator it = roles.begin(); it != roles.end(); ++it)
+                it.value() = QVariant();
+            model->setItemData(index, roles);
+        }
+    }
+#endif
+}
+
+/*!
+    \internal
+
+    When persistent aeditor gets/loses focus, we need to check
+    and setcorrectly the current index.
+  */
+void QAbstractItemViewPrivate::checkPersistentEditorFocus()
+{
+    Q_Q(QAbstractItemView);
+    if (QWidget *widget = qApp->focusWidget()) {
+        if (persistent.contains(widget)) {
+            //a persistent editor has gained the focus
+            QModelIndex index = indexForEditor(widget);
+            if (selectionModel->currentIndex() != index)
+                q->setCurrentIndex(index);
+        }
+    }
+}
+
+
+QEditorInfo QAbstractItemViewPrivate::editorForIndex(const QModelIndex &index) const
+{
+    QList<QEditorInfo>::const_iterator it = editors.constBegin();
+    for (; it != editors.constEnd(); ++it) {
+        if (it->index == index)
+            return *it;
+    }
+
+    return QEditorInfo();
+}
+
+QModelIndex QAbstractItemViewPrivate::indexForEditor(QWidget *editor) const
+{
+    QList<QEditorInfo>::const_iterator it = editors.constBegin();
+    for (; it != editors.constEnd(); ++it) {
+        if (it->editor == editor)
+            return it->index;
+    }
+    return QModelIndex();
+}
+
+void QAbstractItemViewPrivate::removeEditor(QWidget *editor)
+{
+    QList<QEditorInfo>::iterator it = editors.begin();
+    for (; it != editors.end(); ) {
+        if (it->editor == editor)
+            it = editors.erase(it);
+        else
+            ++it;
+    }
+}
+
+void QAbstractItemViewPrivate::addEditor(const QModelIndex &index, QWidget *editor, bool isStatic)
+{
+    editors.append(QEditorInfo(index, editor, isStatic));
+}
+
+bool QAbstractItemViewPrivate::sendDelegateEvent(const QModelIndex &index, QEvent *event) const
+{
+    Q_Q(const QAbstractItemView);
+    QModelIndex buddy = model->buddy(index);
+    QStyleOptionViewItemV4 options = viewOptionsV4();
+    options.rect = q->visualRect(buddy);
+    options.state |= (buddy == q->currentIndex() ? QStyle::State_HasFocus : QStyle::State_None);
+    QAbstractItemDelegate *delegate = delegateForIndex(index);
+    return (event && delegate && delegate->editorEvent(event, model, options, buddy));
+}
+
+bool QAbstractItemViewPrivate::openEditor(const QModelIndex &index, QEvent *event)
+{
+    Q_Q(QAbstractItemView);
+
+    QModelIndex buddy = model->buddy(index);
+    QStyleOptionViewItemV4 options = viewOptionsV4();
+    options.rect = q->visualRect(buddy);
+    options.state |= (buddy == q->currentIndex() ? QStyle::State_HasFocus : QStyle::State_None);
+
+    QWidget *w = editor(buddy, options);
+    if (!w)
+        return false;
+
+    if (event)
+        QApplication::sendEvent(w->focusProxy() ? w->focusProxy() : w, event);
+
+    q->setState(QAbstractItemView::EditingState);
+    w->show();
+    w->setFocus();
+
+    return true;
+}
+
+QPixmap QAbstractItemViewPrivate::renderToPixmap(const QModelIndexList &indexes, QRect *r) const
+{
+    Q_Q(const QAbstractItemView);
+    QRect rect = q->visualRect(indexes.at(0));
+    QList<QRect> rects;
+    for (int i = 0; i < indexes.count(); ++i) {
+        rects.append(q->visualRect(indexes.at(i)));
+        rect |= rects.at(i);
+    }
+    rect = rect.intersected(viewport->rect());
+    if (rect.width() <= 0 || rect.height() <= 0)
+        return QPixmap();
+    QImage image(rect.size(), QImage::Format_ARGB32_Premultiplied);
+    image.fill(0);
+    QPainter painter(&image);
+    QStyleOptionViewItemV4 option = viewOptionsV4();
+    option.state |= QStyle::State_Selected;
+    for (int j = 0; j < indexes.count(); ++j) {
+        option.rect = QRect(rects.at(j).topLeft() - rect.topLeft(), rects.at(j).size());
+        delegateForIndex(indexes.at(j))->paint(&painter, option, indexes.at(j));
+    }
+    painter.end();
+    if (r) *r = rect;
+    return QPixmap::fromImage(image);
+}
+
+void QAbstractItemViewPrivate::selectAll(QItemSelectionModel::SelectionFlags command)
+{
+    if (!selectionModel)
+        return;
+
+    QItemSelection selection;
+    QModelIndex tl = model->index(0, 0, root);
+    QModelIndex br = model->index(model->rowCount(root) - 1,
+                                  model->columnCount(root) - 1,
+                                  root);
+    selection.append(QItemSelectionRange(tl, br));
+    selectionModel->select(selection, command);
+}
+
+QModelIndexList QAbstractItemViewPrivate::selectedDraggableIndexes() const
+{
+    Q_Q(const QAbstractItemView);
+    QModelIndexList indexes = q->selectedIndexes();
+    for(int i = indexes.count() - 1 ; i >= 0; --i) {
+        if (!isIndexDragEnabled(indexes.at(i)))
+            indexes.removeAt(i);
+    }
+    return indexes;
+}
+
+
+QT_END_NAMESPACE
+
+#include "moc_qabstractitemview.cpp"
+
+#endif // QT_NO_ITEMVIEWS